What was found
ON SLATS RETRACT UNCOMMAND ROLL TO THE RT, REQUIRE FULL LT AILERON AND RUDDER, NO SLAT DISAGREEMENT, NO ALERT, MOVE SLAT HANDLE BACK TO SLATS EXTEND, ACFT UNDER CONTROL, MADE NORMAL FLAPS 35 LANDING PVG WITHOUT INCIDENT. INSTALLED THE LT OTBD SLATS BALANCE RELIEF VALVE IAW AMM 27-82-12-4. PRESSURIZE ALL THE HYD SYS AND PERFORMED LEAK CHECK FOR BOTH LT SLAT BLANCE RELIEF VALVE, OTBD SLAT CONTROL VALVE AND BOTH CHECK VALVE NO LEAK FOUND. PERFORMED THE SLAT BLANCE RELIEF VALVE FUNCTIONAL TEST IAW AMM 27-86-00-5, ALL TEST SATISFACTORY. PERFORMED THE ELECTRIC SLAT CONTROL SYSTEM OPS, ALL TEST IAW AMM 27-86-00-5, ALL TEST PASSED. ITEM CLOSED FOR TEST FLIGHT.