As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT - FL 94 AFTER TAKEOFF, THE CREW NOTED THAT THE NR 1 IDG FAULTED. ALTHOUGH THE APU WAS OPERATIONAL, THE APU AFT FUEL PUMP WAS ON MEL AND THE CREW ELECTED TO RETURN TO CLT. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND FIELD WIRE 2422-60108 SHORTING TO THE SHIELD WIRE. THE WIRE WAS REPAIRED, SEPARATED AND INSULATED.