As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT FROM ATW-ATL, AT APPROXIMATELY 20,000 FEET, THE CREW RECEIVED A RIGHT REVERSER UNLOCKED CAUTION MESSAGE. THE CREW COMPLIED WITH THE QRH AND DECLARED AN EMERGENCY. THE AIRCRAFT RETURNED TO ATW, WHERE IT LANDED SAFELY. MAINTENANCE PERFORMED OPERATIONAL TESTS OF THRUST REVERSER SYSTEM IAW CRJ-200 AMM 71-00-00-710-806. NO DEFECTS WERE NOTED. OPS CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)