It does sound like you may have multiple issues here. Lets first address the camera error NDC001 often times the connection on the logic board gets messed up either not fully inserted or corrosion. Referencing this guide [guide|45134] jump down to Step 11 to make sure the logic board area is clean and the connector is making good contact.
I suspect what maybe an issue here is someone did have a spill but it didn’t seep to the bottom side of the logic board which is what you normally see after taking the bottom cover off. You’ll really do need to fully remove it to inspect the other side.