Installed new battery and charger dock, now no ringer/speakerphone?

I bought a new battery because my old one was going dead within 3-4 hours after a full charge. Right after that I realized it was probably a dock/charger problem, because if I wiggled the internal docking module, it sometimes solved the problem.

So I bought a pre-assembled dock unit from Amazon that was supposed to include a new vibrate/buzzer (it didn't) and tools (they were useless - the iPhone has no Star-headed screws), then I watched the videos on this site and tried to swap both items.

I think the battery worked out OK, although I had to tape it to the logic board to get it in just right.

As soon as I got everything assembled, I noticed I could not use the speakerphone. Then I noticed I could not adjust the sound up or down using the side buttons, unless I'm in "Settings", then they work fine.

Am I right in thinking that my dock unit has a bad speaker?

Or maybe the ribbon connector (#7) has gone bad?

I had a tough time reconnecting #7, #3 and #6, maybe I tore/bent/broke something?