What was found
IN FLIGHT (CLT TO ROC) THE L REV UNLOCKED CAUTION MESSAGE ILLUMINATED. THE CREW OF FLIGHT 2532 FOLLOWED THE QRH, RETURNED TO CLT, AND MADE AN UNEVENTFUL LANDING. PSA MAINTENANCE DEFERRED THE LT THRUST REVERSER AND C/W THE M FUNCTION IAW CRJ 200 MEL 78-30-01 B. THE AIRCRAFT WAS THEN RELEASED FOR SERVICE. ON 25MAR05 AFTER TROUBLESHOOTING, THE MEL WAS CLEARED BY LUBRICATING THE LT THRUST REVERSER PDU LOCK PISTON IAW CRJ 200 AMM 12-20-78-640-805. OPERATIONAL CHECKS WERE GOOD IAW CRJ 200 AMM 78-30-00-720-809. THE AIRCRAFT WAS THEN RELEASED FOR SERVICE.