As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE DOING PHASE INSPECTION MAINTENANCE CARRIED OUT INSPECTION OF THE STARTER/GENERATOR DRY SPLINE AND FOUND IT TO BE CLOSE TO LIMITS. ENGINE WAS REMOVED, ACCESSORY GEARBOX SPLIT, GEARSHAFT, PN 3021565. REMOVED AND O/H GEARSHAFT INSTALLED. ENGINE REINSTALLED GROUND RUNS CARRIED OUT.