What was found
AFTER TAKEOFF NOSE GEAR FAILED TO RETRACT. DURING POM PROCEDURE GEAR HANDLE WOULD NOT RAISE. CONTINOUS T/O AURAL WARNINGS OF FLAPS, STABILIZER, SLATS IN AIR. NO PRESSURIZATION AUTO FAIL INOP 1 AND 2. AUTO SPOILERS INOP OAP MESSAGE. ALSO HAD LEFT AND RIGHT STRAKE FAULT MESSAGE ON STATUS MSG. TAIL TEMP FAULT AND STRAKE ICE MSG ON OAP. FOUND O-RING ON NOSE GEAR STRUT SERVICING SCHRADER VALVE IN POOR CONDITION. REPLACED SAME. SERVICED NOSE STRUT PISTON PER MM. INSP NLG STRUT PISTON IN FULL EXT. CHECKED GOOD CYCLED ALL 3 GEARS SEVERAL TIMES, OPS AND INDICATION NORMAL.