RA300 Amp - Channel 2 is Weak and has Static.

I have a used RA300 amp. I've replaced the relay switch and the pair of 10000UF caps. I have also sprayed electronic cleaner into the volume pots, and rotated them back and forth. But Channel 2 is still crackly... and not as loud as Channel 1. There are a lot of dead spots. Tell me this... are the volume pots supposed to be wobbly...? Both of mine are. Like they've become really loose. I did see where the previous owner dropped the unit, because the heat sink fins were bent. Perhaps he also has hit the knobs once or twice, too. The pots seem to be part of a small circuit board. I cannot see how to tighten them. Any insight...?
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