Did I kill the mixer?

On last gig, I had to rely on my backup amp for monitoring purpose: a
Yorkville 100k (it's a multi-purpose full-range combo with a 3 channel
mixer). It did the job quite well.

Back home, since the pots are all becoming hard to turn and are very,
very noisy, I decided to clean them all since that combo prooved to be
useable. I got my can of contact cleaner and unmounted the mixer/amp.
I sprayed some liquid into the pots and played with each of them until
they were smooth.

When I plugged everything back, the unit is no longer working. Well,
the Amp In is still working. And I can also hear the reverb signal
when turned to 10. Looks like anything coming from the mixer part of
the circuit is not working.

I doubt that the pots are causing the problem. I must have bumped
something...

Any of you know how to troubleshoot this kind of problem?

--
Frederic Gelinas
.

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