As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3377 - ON APPROACH TO DTW, THE LEFT GEAR DOWN LIGHT DIDN'T ILLUMINATE AFTER GEAR EXTENSION. THE CREW CYCLED THE GEAR AND RECEIVED A NORMAL INDICATION. MAINTENANCE CLEANED AND LUBED THE GEAR DOWN SWITCH. SYSTEM OPERATED SATISFACTORILY. (W)