As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE EN ROUTE FROM UCY/DET, LEFT ENGINE OIL PRESSURE STARTED TO DROP. ENIGNE WAS SHUT DOWN AND AIRCRAFT DIVERTED TO BMG. FOUND NR 1 CYLINDER STUDS BROKEN AND NR 1 CYLINDER LOOSE ON MOUNTING PAD. C/W AD 56-06-02(C) BY REPLACING ALL STUDS ON NR 1 CYLINDER MOUNT PAD AND INSTALLING OVERHAULED CYLINDER ASSEMBLY.