As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE, WITH THE NR 2 ENGINE INTEGRATED DRIVE GEN (IDG) ON MINIMUM EQUIPMENT LIST (MEL), THE AUXILARY POWER UNIT (APU) SHUT DOWN DURING FLIGHT. FLIGHT DIVERTED TO PIT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACE THE NR 2 ENGINE IDG AND REMOVED MEL. THE APU WAS THEN PLACED ON MEL. FURTHER ACTION IS PENDING.