Good news, both channels on the parts amp are working, along with the preamp and tone controls. About the only electrical fault is the relay ckt. It does have some physical damage on the back, some of the speaker terminals are damaged and some rca jacks are damaged Just like my original 9100 The power switch was bent 90 degrees over I broke the original amps switch trying to straighten it, so I got creative and used some locking forceps and soldering iron to heat up the shaft and then carefully bend the switch back to its normal position And it worked !!!