Bring it to John Rutan in Verona NJ - AudioConnection. He's got great techie on Marantz equipment.
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It is probably as simple as cleaning the controls. the volume, balance, etc. pots. I have found that this works great and before spending money to fix something that may be relative easy to fix by sending it away. find a good electronic spray contact cleaner. Unplug the unit for a day. find the various pots and most of the older ones actually have access for spray to get into them. Be generous with the spray and have at it.
Thanks guys. I was thinking it was probably due for a good cleaning but was also thinking the parts are getting pretty old and it really needs to be looked at by a qualified tech. I have been to Audio Connection once a few years back and they seemed like nice people but I didn't get a chance to stay there long. It's about an hour and a half ride for me. I didn't know they had techs there but I know they have a great reputation. I will be contacting them. Thanks all.