Can you give more detail on where to find R73/R74? I have the problem that *only* the front sled RCA connection has a problem; the rear sled and empeg-internal connnections are fine.

The front left crackles in and out quietly but the left sounds normal. I'm picking that R73, R74 are left and right channels and i have only one with a problem?
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ToolPeg: 010101886 Mk2a 120Gb GrillPeg: 010101956 Mk2a 80gb