As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE GROUND FAULT INDICATOR ILLUMINATED. PERFORMED NR 1 ENGINE GROUND FAULT INDICATION IAW B727 MEL B 26-9 CAT C CONTROL 7893 PLACARD INSTALLED. FOUND AFT CONNECTOR ON ENGINE FIRE LOOP DIRTY AND SLIGHTLY LOOSE. CLEANED AND SECURED PLUG. FIRE WARNING CKS GOOD PER MM 26-11-00.