As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SFO - FORWARD DOOR WARNING LIGHT FAILS TO ACTIVATE WITH DOOR OPEN ON GROUND. MAINTENANCE DEFERRED DOOR WARNING SYSTEM PER MEL 52-70-1. AIRCRAFT RETURNED TO SERVICE. SUBSEQUENTLY MAINTENANCE FOUND BROKEN WIRE AT PASSENGER DOOR MICROSWITCH. REPAIRED WIRE AT MICROSWITCH. DOOR WARNING SYSTEM OPERATIONAL CHECK NORMAL.