I think it;s like a lot of older electronics. Caps go bad. The amplifier develops issues with caps or resisters going out of spec over 30 years. There is a guy on here who rebuilds and troubleshoots them. I think Charmlu VS-tech can point you to him.... I know there have been prior threads about this.
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1978 Mercedes 240D
1981 Mercedes 240D
1982 Mercedes 240D
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