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Kind of in the weeds, but... Working on a made in China CL, so newer than the US ones I've worked on before. The power tube board is fitted with all the components marked, but update TIB0003 and later schematics I have seen say "DO NOT STUFF" or to remove the 1N4007 diodes across the 220 ohm...

Folks, I just picked up my second 4Pro, and found an apparent channel volume difference; channel B seems noticeably louder than A. I drove the amp with a tone, I measured each output at two volumes: 0.101V vs. 0.122V, and 0.295V vs. 0.326V (A vs. B, same cabinet load). I measured the bias...