As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DTW - FLT 3386 - ON APPROACH TO DTW THE NOSE GEAR WAS SLOW TO SHOW DOWN AND LOCKED AFTER GEAR EXTENSION. MAINTENANCE WAS UNABLE TO DUPLICATE THE DISCREPANCY. AS A PRECAUTION, THE NOSE GEAR AND POSITION SWITCHES WERE CLEANED AND LUBED. (X)