As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FINAL APPROACH, GEAR WENT DOWN AND GEAR DOOR OPEN LIGHT WENT OUT. AT 400 AGL, GEAR DOOR OPEN LIGHT CAME BACK ON. DID MISSED APPROACH. CYCLED THE GEAR EARLY FOR SECOND APPROACH. ON FINAL FOR SECOND APPROACH, GEAR DOOR OPEN LIGHT CAME BACK ON. FOLLOWED ABNORMAL AND PULLED EMERGENCY GEAR EXTENSION HANDLE. LANDED STRAIGHT AHEAD ON RUNWAY AND STOPPED IAW ABNORMAL WITHOUT INCIDENT. REMOVED AND REPLACED MAIN GEAR DOOR POSITION SWITCH. OPS CHECKED GOOD AT THIS TIME IAW DC-9 MM 32-60-03-2-0101.