As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE A5 CHECK SCHEDULED MAINTENANCE WHEN REPLACING STARTER OIL. DRAIN PLUG FOUND WITH MISALIGNED THREADS. REPLACEMENT DRAIN PLUG ORDERED FOR REPLACEMENT. WHILE REMOVING DRAIN PLUG HELICOIL CAME OUT OF PLUG HOUSING ON STARTER. UNABLE TO REPAIR HELICAL. STARTER REPLACED WITH SUCCESSFUL FUNCTIONAL CHECK.