As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AN APU FIRE WARNING ON GROUND WITH BLACK SMOKE COMING FROM EXHAUST. GROUND EMERGENCY DECLARED. NO EVIDENCE OF FIRE WAS FOUND AND APU WAS PUT ON MEL. MAINTENANCE FOUND THE APU HARNESS DAMAGED. HARNESS WAS REPLACED IAW EMB MM AND OPERATIONAL CHECK WAS COMPLIED WITH, NO DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE. (M)