As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRE DETECTION FAULT NOTED ON PREFLIGHT. GROUNDED - YES. FOUND #2 ENGINE OVERHEAT LIGHT AND HANDLE LIGHT NOT ILLUMINATING DURING TEST. CYCLE A/C POWER REF AMM 20-60-99. A LOOP TEST NORMAL. B LOOP INOP. ENGINE APU FIRE BITE SHOWS #2 ENGINE LOOP B RIGHT CORE FAULT. FOUND BROKEN FIRE HARNESS AT HERMETICAL LUG FOR B SIDE. REMOVED AND REPLACED RIGHT CORE HARNESS IAW AMM 26-11-01. OPS CHECKS GOOD IAW AMM 26-11-00. ETOPS GROUND VERIFICATION GOOD.