As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 716 FROM MEM TO HRL, ON DESCENT INTO HRL THE 1 ENGINE LOW OIL PSI LIGHT ILLUMINATED FOLLOWED BY A LOSS OF OIL QUALITY. THE NR 1 ENGINE WAS SHUT DOWN AND LANDED WITHOUT INCIDENT. POST FLIGHT INSPECTION REVEALED A MISSING HELI COIL ON THE GEARBOX. REMOVED AND REPLACED NR 1 ENGINE MAIN ACCY GEARBOX. OPS AND LEAK CHECK GOOD, NO OTHER DEFECTS WERE NOTED. AIRCRAFT WAS RETURNED TO SERVICE.