Sounds like you need to flush the pots (potentiometers). This might be a little tricky; some Marantz receivers don't have much access to them. Try taking both top cover and bottom cover off. You need to get some sort of cleaning spray, preferrably silicone based, to do the job. Also if it has a long plastic tube, the better. You need to spray the liquid into the pot itself (of course with the power turned off). Once this is done, twist the knob back and forth a few times. Do this for all pots and switches. Then enjoy your Marantz for another 10 years or so. Occasionally pot contact switches go bad but this is very rare on a Marantz. Let me know how it worked.
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