The black and white wires with the push-on connectors look like they'd go to the speaker. See if there are tabs on the frame of the speaker, verify whether or not anything is attached. And allow me to advise you to be careful! Always double-check that the amp is not plugged into the wall and has been allowed to sit for some time while the power supply discharges. You could get a nasty shock. Also, shorting those wires together while under power will result in damage to the amp.
edit: the reason I say the wires might go to the speaker is that I can't see from your pictures what else may connect to it. Be sure to double check, maybe additional pictures (good job with the ones you took!) will help us 'see' to finish the repair.