As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT INBOARD TO SLC, UT. OIL PRESSURE FLUCTUATION NOTICED. ENGINE FEATHERED AS PRECAUTION. OIL LEAK AT BACK OF ENGINE. INSPECTION FOUND MAGNETO BASE FRACTURED AT LOWER HOLD-DOWN AREA OF CONTACT, 1/4 MOON SHAPE CHUNK HAD BROKEN OFF. SUBMITTER SUSPECTED EXCESSIVE TORQUE ON STUD OR HOLD-DOWN NOT PROPERLY SEATED. AIRCRAFT MADE UNEVENTFUL LANDING.