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Marantz 2220 B problem with L side stereo channel

I bought my current 2220 B about a year ago, and it was working perfectly. Recently, I've had a problem with the left stereo channel cutting off, but it is intermittent. When I turn on the stereo, the left channel works fine, but will cut off after 10 minutes or so. When I switch to mono, the left channel works. I'm on here to see if there's an easy fix to the problem- I have experience soldiering onto a circuit board, so I feel like I could do the repair if given a little guidance. Thanks!



Re: Marantz 2220 B problem with L side stereo channel

Has the amplifier board had the electrolytic capacitors replaced? The pre-amp board may need them also.
I usually don't try to find the bad caps; just replace them all, as this equipment is approaching 50 years old. I also clean the controls and switches--Deoxit D5 is good.