As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT LEVEL ONE FIRE DET 2 FAIL APPEARED. FOUND 1EA CLIP BROKEN ON UPPER LEFT DETECTOR ASSY WHICH TORE OFF BOTH LOOPS. DUE UPPER TURBINE DETECTOR BROKEN CLIP REQUIRES REPLACE LOOP ASSY. REMOVED AND REPLACED NR 2 ENG UPPER TURBINE LEFT ENG FIRE DETECTOR PER MM 26-11-03, ALSO PERFORMED FCDU RTS TEST, PASSED NO FAULT FOUND, PREMATURE REMOVAL/INSTALLATION OFF MFG 224-9743-509.