As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT TO DTW THE LT THRUST REVERSER UNLOCKED MSG ILLUMINATED. THE FLIGHT CREW COMPLETED THE QRH PROCEDURES AND DECLARED AN EMERGENCY. THERE WERE NO ADVERSE ACFT HANDLING ISSUES. AN OTHERWISE NORMAL APPROACH AND LANDING WAS MADE AT KDTW. MX INSPECTED THE THRUST REVERSER AND FOUND NO PROBLEMS WITH IT. AFTER AN OP CHECK OF THE REVERSER, THE ACFT WAS RELEASED FOR SERVICE.