As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT A LOSS OF ENGINE OIL PRESSURE WAS NOTED ON NUMBER TWO ENGINE. SECURED NUMBER TWO ENGINE PER COM AND SHUTDOWN. FOUND GEARBOX CASE STUD MISSING. REMOVED AND REPLACED ENGINE GEARBOX PER MM 7260. PERFORMED POWER ASSURANCE CHECK WITH ALL OPERATIONS NORMAL.