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It very well might be the OVP, the OVP supplies power to multiple key electronics including the ECU and MAS units.
Carefully open up the OVP and see whats rattling in it. You can attempt to repair any broken solder joints and clean up any corrosion.
My 190E's OVP was bad and very corroded. I ended up tearing it apart and it fixed up fine, that was 4-5 years ago.
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