1988 Fender Princeton Chorus amp
First of all Phil is probably right. But then if you want to try things on your own...
The chips you mentioned are probably the clock and BBD. They really should not affect the level of sound.
Turn the chorus off and see if you are getting the same volume out of each speaker.
If the sound is equal then you need to go right after the BBD circuit. If not it could be in the amp on that side anywhere.
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