I am working on a Fisher CA-283 amplifier, without a diagram. I have
repaired the problem of the channels intermittently dropping out, and
now have one problem left to solve: when you select Video Aux, and
then select tape monitor for inputs, the LED for Video Aux stays lit,
even though you have tape monitor selected (it is lit also). There
must be a chip on the unit that is defective that is causing this
combination. Anyone have any ideas of which chip it is? Any pointers
appreciated. Thanks in advance.

Mike