Most likely the problem, i.e. about a 75-90% of all 911 3.2 DME failures, was a marginal solder connection
at the ignition coil driver where it connects at the circuit board:
That is one of three solder connections that most all DIYs can easily repair (about 15 minutes)
and save the cost of a very simple "rebuilding" that most "rebuilders" charge $400 - $500 for.
These connections should always be checked before wasting money on a rebuilt DME. The typical
symptom is either an intermittent spark and/or intermittent running.