I have had my head gasket and wiring harness replaced on my 95 C36. There are updates for each so theoretically it should not happen again. The wiring harness was done on goodwill from MB (at local dealership). Benzmac did the head gasket which was not covered since the car was out of warranty. (no goodwill from MB this time) Since both were fixed I see no evidence of the problems reoccuring.
Hope this helps...Lee