Right fan 0 RPM, but spinning minimum speed

Device was getting hotter than normal so I thought to change the thermal paste since it hasn’t been changed since 2018.

I opened the device, removed the board and put everything back together again; however, on booting into macOS and using iStatMenus to check the thermals it showed that the right fan is reporting 0 rpm and trying to control the speeds for the right fan doesn’t work but the fan does spin on what seems to be the lowest speed. I don’t know if this was an issue from before or because of me.

Left fan works fine and reports speeds correctly.

Running Apple Diagnostics it reported error PPF003 and after some research I decided to change the right fan especially since I do confess to not unlocking the latch for the zif connectors while removing them so I thought I might’ve damaged the flex cable or connector but visually nothing seems broken so I got a used one from a local parts supplier and tried it but it didn’t fix the issue and running apple diagnostics again it now shows PPF003 and PPF004 and I’m not sure If the PPF004 was also in the first test and I just didn’t notice it I will try to place back the old fan to see if the second code disappears.

Some users on this board says changing the keyboard flex cable might fix the issue; however, before spending any more on unnecessary items is there a way to test wether it’s the cable, fan or anything else? I know my way around circuits but I never did it on a laptop’s motherboard.

Any help is greatly appreciated.

Thanks in advance.

Edit 1:

Here are a pics of what I can do.