As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SFO - LEFT MAIN LANDING GEAR 'B' SYSTEM GREEN INDICATION LIGHT ILLUMINATED IN FLIGHT DURING DESCENT. MAINTENANCE DEFERRED LANDING GEAR 'B' INDICATION SYSTEM PER MEL 32-60-1. AIRCRAFT RETURNED TO SERVICE. MAINTENANCE SUBSEQUENTLY REPLACED LEFT MAIN LANDING GEAR 'B' SYSTEM DOWNLOCK PROXIMITY SENSOR. LANDING GEAR POSITION INDICATION SYSTEM OPERATIONAL CHECK NORMAL. (W)