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Yikes! I've seen better build quality in a 60's Japanese transistor radio!
I can't believe they made that circuit board out of phenolic, that is clearly a case where fiberglass would be best.
Apart from cleaning the relay contacts which you already did, I would carefully check the back of the circuit board for cracked or stressed solder joints and touch up any suspects...... Just don't put too much heat on the leads for the ICs, they won't appreciate it. Pay special attention to the solder joints on the module's pins.
If you're feeling frisky, replace those electrolytic capacitors as bad electrolytics are a common cause of circuit failure in general......
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-tp
1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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