As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4403 - DURING CLIMB THROUGH 10,000 FEET FROM GRR-ATL, A RIGHT THRUST REVERSER UNLOCK MESSAGE OCCURRED AND AN EMERGENCY WAS DECLARED. THE AIRCRAFT RETURNED TO GRR AND LANDED SAFELY. MAINTENANCE DEFERRED THE THRUST REVERSER SYSTEM IAW MEL NR 78-30-1. (M)