What was found
THE FLIGHT WAS TAKING OFF RWY 31 IN PIA AT 30KTS THE CREW RECEIVED A RT REVERSE UNSAFE CAUTION MESSAGE AND ABORTED TAKEOFF AND RETURNED TO GATE. DEF RT THRUST REVERSER SYSTEM, PER MEL 78-30-01 CAT C. M/FUNCTION C/W. DEACTIVATED THE RT THRUST REVERSER, IAW CRJ 700 AMM 78-30-00-040-801-A01 AND ISOLATED THE TRAS, IAW CRJ 700 AMM 78-32-00-910-801-A01. REMOVED AND REPLACED K28, JB-5 RELAY, IAW CRJ 700 AMM 24-03-09-000/400-801-A02. OPERATIONS TEST GOOD AT THIS TIME. THIS CLEARS MEL. PERFORMED OPERATIONS CHECK OF RT THRUST REVERSER, IAW CRJ700 AMM 78-30-00-720-801-A01. OPERATIONS CHECK GOOD.