As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING AT 90 KTS TRANSFER OF CONTROLS TO CAPTAIN, ENGINE NR 1 SHUT-DOWN AS REVERSER WERE BEING STOWED. NR 1 REVERSER NEVER STOWED. PERFORMED GROUND RUNS IAW CRJ AMM 71-00-00. PERFORMED OPS CHECK OF NR 1 ENGINE THRUST REVERSER IAW CRJ AMM 71-00-00 RIGGING CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.