As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER READING A SERVICE DIFFICULTY REPORT IN 'AVIATION MAINTENANCE' MAGAZINE, AN INVESTIGATION OF THE GROUND POWER PLUG CONNECTIONS REVEALED THE POSITIVE CABLE ON THE PLUG TO BE BURNED AND MELTED. THE PLUG PINS AND CONNECTIONS SHOWED NO SIGN OF DAMAGE.