As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DTW - FLT 3186 - ON APPROACH, THE RT GEAR INTRANSIT LIGHT FAILED TO ILLUMINATE UPON GEAR EXTENSION. ALL OTHER GEAR INDICATIONS WERE NORMAL. MAINTENANCE WAS UNABLE TO DUPLICATE THE DISCREPANCY. AS A PRECAUTION, MAINTENANCE CLEANED AND LUBED ALL OF THE RT GEAR'S MICROSWITCHES. (W)