As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DTW - FLT 3182 - ON APPROACH, LT MAIN INTRANSIT LIGHT DID NOT ILLUMINATE UPON GEAR EXTENSION. THE CREW CYCLED GEAR AND THE PROBLEM RECURRED. BOTH TIMES THE DOWN AND LOCKED INDICATION WAS RECEIVED. THE AIRCRAFT CONTINUED TO DTW. MAINTENANCE CLEANED AND LUBED GEAR SWITCHES. SYSTEM OPERATED SATISFACTORILY. (X)