As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH INTO DTW (FLIGHT 3867) RECEIVED FLIGHT GEAR DISAGREE MESSAGE FOR THE LEFT MAIN GEAR RED NOSE AND RIGHT MAIN UP RAN. CYCLED GEAR ONCE AND RECEIVED 3 GREEN NORMAL AND LANDED AT DTW. FOUND LEFT MAIN LANDING GEAR UPLOCK TARGET LOOSE. RE-ADJUSTED TARGET AND INSTALLED WASHER IAW CMM 32-30-15. PERFORMED GEAR RETRACTION EXTENSION IAW AMM 32-30-00. OPS CHECK GOOD.