What was found
EN ROUTE, DURING CLIMB, THE FLIGHT EXPERIENCED A LT THRUST REVERSER UNLOCKED CAUTION MESSAGE. THE CREW COMPLIED WITH THE QRH, NOTIFIED DISPATCH, AND DIVERTED TO KSYR. AIRCRAFT REMOVED FROM SERVICE. PDU LOCK WILL NOT FULLY STOW R & R PDU, IAW AMM 78-30. OPERATIONS CHECK GOOD. REMOVED PLACARD REMOVED FROM MEL.