As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SFO - LEFT FIRE PANEL 'DET INOP ENG/WW' LIGHT ILLUMINATED. MAINTENANCE REMOVED AND REPLACED LEFT ENGINE FIRE DETECTOR. FIRE DETECTION SYSTEM OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE. MFG PART NUMBER 3601-75-450/160C-5.8M. (X)