As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD EQUIP OVERHEAT IN AUTO AND STANDBY DURING TAXI, AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE TROUBLE SHOT AND REMOVED ELECTRICAL POWER FROM AIRCRAFT. RAN FIM 21-58-00 (SPECIAL FREIGHTER SUPPLEMENT). FWD SUPPLY FAN OPERATING NORMALLY IN "AUTO" MODE WITH ELEC POWER. SYSTEM OPERATES NORMALLY. AIRCRAFT RETURNED TO SERVICE.