What was found
DURING APPROACH, THE T/E FLAPS ASYMMETRY LIGHT WAS SHOWN WHEN FLIGHT CREW SELECTED FLAPS 1 GRADE, DISCONNECTING THE YAW DAMPER, SO THE FLIGHT CREW PERFORMED THE QRH 9.28 AND 9.40 PROCEDURES, LANDING WITH T/E FLAPS UP AND REFERENCE SPEED OF 161 KNOTS AND MAXIM AUTO BRAKED. DURING MX REVISION WAS DETECTED BLOCKADE IN THE HYD SYS CONTROL STANDBY, SO THE STBY RUDDER PCU SHUTOFF VALVE WAS REPLACED IAW MM 27-21-94; THE FIM PROCEDURE 27-32 TASK 813 WAS PERFORMED AND YAW DAMPER SYS OPS TEST WAS PERFORMED IAW MM 22-23-00, ALL CORRECT.