Keyboard not working, told trackpad needs replacing
My computer received a coffee bath and wouldn't turn on without the power cord connected, so I sent it in to a repair shop in CA to get the logic board repaired. Once they finished repairing the logic board, they told me the trackpad also needed to be replaced. I found this odd because I seem to recall it working when I had sent it in. There is a bit of corrosion on the trackpad PCB by the battery, but it seems to mainly be around the connector for the cable that leads back to the motherboard.
The repair shop told me not to reconnect the trackpad cable until the trackpad was replaced, lest I cause more damage to the logic board. I've tried asking them a couple of times now if there was anything repaired on the logic board that was caused by the trackpad, but they have not answered my question.
Is it even possible for that board to short anything out on the main logic board? Isn't it primarily low-voltage signals being sent over the trackpad cable?
Basically, I'd like to know if I can reconnect the cable to test it without damaging my computer. Given that it was working before, I'm inclined to say they just saw the corrosion and told me it needed to be replaced (for $150, where only $30 of that is parts).
Is this a good question?