As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED LOWER OIL PRESSURE, RT ENGINE. TROUBLESHOT TO BROKEN TOOTH ON STARTER ADAPTER SHAFT AND FAILED BEARING IN CRANKCASE. BEARING SUPPORT WAS OVERSIZED, FILLING ENGINE OIL SYSTEM WITH METAL. NO PREVIOUS INDICATION OF C/W TCM CSB NR 94-4 COULD BE FOUND.