As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: WITH THE RIGHT ENGINE IDG INOPERATIVE AND ON MEL THE APU AUTO SHUTDOWN AT ALTITUDE AND TEH AIRCRAFT WAS DOWN TO ONE POWER SOURCE. AN EMERGENCY WAS DECARED AND THE AIRCRAFT DIVERTED TO MEM WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE APU LOW OIL PRESSURE SWITCH PER AMM 49-94-14.