As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE NUMBER 1 FIRE CONTROL SWITCH RED LIGHT ILLUMINATED IN CRUISE WITH NO OTHER FIRE WARNING INDICATIONS. LIGHTS TEST SWITCH IS TURNING THE LIGHT ON BRIGHT AND DIMMING IT ALSO. FAULT VERIFIED ON GROUND. REPLACED ENGINE AND APU FIRE DETECTION MODULE IN REF AMM 26 10 01. PERFORMED ALL OPERATIONAL TESTS IN REF AMM 26 11 00 710 801 AND AMM 26 15 00 710 801. OPS CHECK GOOD ON GROUND.