hello etienne, have had a few 9500's with same issue, are we talking early 1997 and older???machine, if so there is a black plastic cover on rear engine bay, this is where the ecu is located, remove cover, below ecu there is a small square circuit board with a circuit breaker on it, replace breaker, but also inspect circuit board for burns, or corrosin.72e codes are related to communications harness to tachometer circuit,with out this the combine will die as you have described, hope this will help, deerefever.