As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1744 CLT - PHL - ELECTRICAL POWER LOSS - AIRCRAFT DEPARTED CLT WITH THE NR1 IDG ON MEL. CREW REPORTED APU AUTO SHUTDOWN AT FL 330. RESTARTED AT FL 290 AND FLIGHT CONTINUED WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE APU OIL COOLER. OPERATIONAL AND LEAK CHECKS WERE GOOD. (S)