As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTS THAT THE STARTER WAS SLIPPING. THE STARTER DRIVE ADAPTER SPRING WAS BROKEN & HAD DAMAGED THE CRANKSHAFT GEAR RETAINING BOLTS & SAFETY WIRE. THE SAFETY WIRE WAS BROKEN & OIL SYS CONTAMINATION WAS POSSIBLE DUE TO THIS. THE ENG WILL NEED TO BE REPLACED DUE TO THE OIL CONTAMINATION CAUSED BY THE STARTER DRIVE ADAPTER FAILURE. ADDITIONAL PHOTOS RELATED TO THIS INCIDENT WILL BE SENT WITH REFERENCE TO THIS SDR