touchbar+trackpad fixed, keyboard still bad, fan high: trackpad fault?

I spilled Brita-filtered water on my mac pro during a muscle spasm. It had a keyboard protector on it, and a bottom casing that lifts it off the surface of the desk a bit. These prevented much of the water from entering via the keyboard or from underneath by pooling. The touchbar and trackpad took the brunt of it. Turned off immediately, stuck papers in the cracks of the trackpad to absorb water, flipped upside down, towels, etc.

After waiting days for it to dry, booting up revealed:

• touchbar displays properly, changes with app, but doesn’t respond to touch
• keyboard doesn’t work, no backlight either
• trackpad doesn’t work
• battery says ‘replace soon’ and does not hold charge for long, but does charge up (water probably got inside and oxidized contacts, making it run poorly)
• otherwise, normal function (external kb and mouse work, bluetooth, wifi, speakers, system operates as normal etc.)

Opening up, I found:

• water traces to the trackpad cable and connector with the trackpad (logic board connection normal)
• water traces on the underside of the logic board on the right side, to the left of the computer’s left fan (which is on the right when it’s upside down being taken apart)
• water traces underneath the logic board as if it leaked through the left screw that secures the left fan (on the right side during disassembly) down on top of the keyboard
• all connections with logic board look good, including touchbar connection, no other damage to logic board visible
• keyboard cable looks pristine on both ends, was sealed under a square of black tape

After cleaning with distilled water and 91% alcohol and reassembling, booting up revealed:

• touchbar now works, responds to touch (I guess reseating the connection did the trick?)
• keyboard still doesn’t work, no backlight either
• trackpad now does work, but sometimes requires a hard click to get it to start working. Clicking doesn’t feel quite ‘right’ (I actually didn’t expect it to work at all because I could still see some corrosion damage to the gold contacts on the cable after cleaning)
• battery still says ‘replace soon’
• both fans now immediately at high speed and do not shut off (I only removed and reconnected the left fan)
• Apple Diagnostics gives error code PPF003 for fan, PPT002 for battery, saying there may be a problem with the fan, and the battery is ok but may need to be replaced soon

I have two major questions:

1. Keyboard issue: Could the trackpad and its cable being faulty cause the keyboard to not work? I know in older Air models, this indeed occurs because the keyboard cable connects to the trackpad’s circuit and the trackpad cable goes from that circuit to the logic board. Even the description of the part on iFixit says the Air’s trackpad cable can affect the keyboard function. However, for the Pro models, the keyboard cable and trackpad cable both independently snap onto the logic board, so you might think it wouldn’t malfunction the same way as the Air. But I found a question about a 2015 Mac Pro where the answer was that a bad trackpad cable was taking out both the trackpad AND the keyboard, even though the part’s description doesn’t mention this like the one for the Air does. Perhaps the keyboard and trackpad are on the same rail on the board or something. In other words: could replacing the trackpad restore the keyboard’s function? Please recall that barely any water got in the keyboard since it had a plastic protector over it
2. Fan issue: Could the new fan issue be caused by the trackpad cable now coming back to life but not working 100% properly? I’ve read in a number of answers that there is some sort of ‘safe mode’ that macs have when there are faulty connections to the logic board or perhaps new components installed, where they turn on the fan full blast to prevent any damage to the logic board. But would you get the PPF003 fan error code when it’s functioning in its ‘safe mode’? Or, does this indicate that I improperly reconnected the left fan? Or that I damaged some part of the logic board that regulates fan speed and temp sensing? I found one question where the solution was that he damaged his logic board during reassembly, but it was only one fan malfunctioning. I found another question where the solution was replacing the trackpad because its logic had gone faulty from water damage, but they had a bunch of other sensor errors. In other words, could replacing the trackpad make the fans run as normal?

Please keep in mind I can’t reset the SMC until my built-in keyboard works again.

Thanks for your help!

—————————————

Before cleaning:

After cleaning, reseating logic board:

Trackpad BEFORE cleaning:

Trackpad cable AFTER cleaning:

Logic board BEFORE cleaning:

Logic board MID/AFTER cleaning:

Under logic board, on keyboard BEFORE cleaning:

Under logic board, on keyboard AFTER cleaning: