As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG 1 OVERHEAT LIGHT IS ON PASSING 25K ENG OVRHT LIGHT CAME ON DID IMMEDIATE ACTIONS REDUDC ED PWR WENT OUT T/S REF FIM TASK 26-11. ALL FAULTS IN OMF SHOW NOT ACTIVE. FOUND ENGINE/APU FIRE DETECTION MODULE, M279 FAULTING THE BOX. REPLACED ENGINE/APU FIRE DETECTION MODULE, M279 REF AMM 26-10-01. OPS CK AND TESTS NORMAL PARTS USED: 1424347,QTY :1ROTABLE PARTS CHANGE WAS INDICATED - TT # 1424347 SN OFF 1620 MODULE, FIRE DE OFF 42-2610-9-0001 1620 ON 42-2610-9-0001 1239