As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE SHUTDOWN ON GROUND, PILOTS REPORTED LT ENGINE OIL PRESSURE DROPPED TO 50 PSI FOR A FEW SECONDS AND THE ENGINE WAS SHUTDOWN IMMEDIATELY. MX FOUND THE OIL CAP POPPED OFF. MAINTENANCE CHECKED SECURITY OF THE CAP AND SERVICED ENGINE OIL IAW BMM 12-12-00 AND 12-12-01. SPECIAL INSPECTION CHECKS PERFORMED IAW MFG 5-50 AND 5-10 AND GMM 4.22.0. ENGINE RUNS SUCCESSFUL. 6 QUARTS TOTAL WAS ADDED TO THE ENGINE.