What was found
INVESTIGATED REPORTED RT ENGINE THRUST REVERSER NOT FULLY DEPLOYING AFTER LANDING. FOUND REVERSER ASSY. STICKING AND UNABLE TO UNLOCK INBD ACTUATOR. UNLOCKED ACTUATOR AFTER ISOLATING AND ACTUATING WITH HAND PUMP. FOUND REVERSER ASSY. UPPER AND LOWER DOOR ACTUATING MECHANISMS VERY STIFF AND DIFFICULT TO MOVE. LUBRICATED THE DOOR ACTUATING MECHANISMS GUIDE RODS AS REQUIRED IAW THE MM 12-20-00 AND 78-30-00 UNTIL FREE MOVEMENT OBTAINED. REASSEMBLED THRUST REVERSER, FOUND TO FUNCTION NORMALLY THROUGH REPEATED CYCLES. TRANSIENT ACFT, MX HISTORY UNKNOWN. IAW MM 12-20-00, THE GUIDE RODS SHOULD BE LUBRICATED EVERY "A" INSP (200 HRS).