Read the capacitor markings on all of those if you could. The kit idea might be fun. The principle is the same: You wash the solder side of the boards with acetone, using a toothbrush, re-solder all the connections except for the transistors (you need to do those carefully with a heat sink if you are going to touch those) and the ICs, and scrap & replace the electrolyte capacitors.

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Henry Bofinger
1989 560 SEL (black/black)
2001 Audi TT Roadster (silver/grey)