As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT, THE CREW RECEIVED A RIGHT HAND ENGINE THRUST REVERSER UNLOCK INDICATION AND RETURNED TO PIT. MAINTENANCE INSPECTED AND REPLACED THE POWER DRIVE UNIT IN ACCORDANCE WITH BOMBARDIER MAINTENANCE MANUAL 78-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.