As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 3133 - ON APPROACH TO DTW, THE LEFT LANDING GEAR TOOK LONGER TO EXTEND THAN THE OTHER GEAR. MAINTENANCE INSPECTED AND CLEANED THE LEFT LANDING GEAR UPLOCK AND ROLLERS. NO DEFECTS WERE NOTED. GEAR SWINGS WERE PERFORMED AND ALL CHECKS WERE FOUND TO BE WITHIN LIMITS. (M)