As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SFO - INTERMITTENT LEFT MLG INTRANSIT LIGHT ILLUMINATION REPORTED DURING GEAR RETRACTION. MAINTENANCE INSPECTED LANDING GEAR POSITION INDICATION SYSTEM. FOUND LEFT MAIN GEAR INTRANSIT LAMP LOOSE IN INDICATOR, PN DN1050ZMK2. RESECURED LAMP IN SOCKET. SYSTEM OPERATIONAL CHECK NORMAL DURING GROUND TEST. AIRCRAFT RETURNED TO SERVICE. (X)