What was found
JACKED ACFT, PERFORMED A SLOW STROKE ON MLG, MLG WENT UP & LOCKED. CYCLED MLG & FLAPS AT THE SAME TIME THROUGH SEVERAL CYCLES WITH NO FAIL. LET ACFT SET FOR 10 MINS, FLAPS WERE UP & MLG DOWN. SELECTED FLAPS DOWN ONLY, STAB MISCOMPARE CAME ON FOR 10 SECS, STAB DID NOT MOVE, LIGHT WENT OUT & STAB MOVED. ATTACHED PRESSURE GAUGE TO TEST RELIEF VALVE. VALVE WOULD OPEN AT 1250 TO 1350 PSI. LUBED ALL 3 UPLOCK ROLLERS AS REQUIRED. CHECKED NLG UPLOCK SWITCH & BRACKET. NO DEFECTS NOTED. REMOVED TEST GAUGE & CYCLED HYD SYS SEVERAL TIMES. SYS OPS & LEAK CHECKS GOOD. CHECKED LT MLG UPLOCK/DOWN LOCK SWITCHES, NO FAULT FOUND. SQ 500 WHILE PERFORMING MLG SWINGS TO TROUBLESHOOT SQ. HYD PRESSURE RELIEF VALVE TO BE "SQUEEKING" & MAKING NOISE, CYCLED MLG, FLAPS & SPEED BRAKES, NOISE WORSE, CONTACTED MX. MX AGREES TO CHANGE VALVE. VALVE PN 4614EX & O-RINGS. REMOVED RELIEF VALVE. BLED HYD & OPERATED ACFT SYS, OPS CHECK GOOD; LEAK CK GOOD. DONE IAW MM 29-11-06. REF SQ NR 300 FOR INSTALL. CONNECTORS AND PCB VISUALLY CHECK GOOD. REMOVED PCB NZ004 & INSTALLED NEW . WORK PERFORMED IAW MM 20-20-05. OPS CHECK OF MLG DUE. SWINGS PERFORMED UNDER SQ NR 500 OPS CHECKS GOOD IAW MM 20-10-00.