What was found
DURING INITIAL CLIMB ONCE THE GEAR HANDLE WAS PUT IN THE UP POSITION WE RECEIVED 3 EICAS MESSAGES. ""NOSE DOOR OPEN"" WARNING, ""GEAR DISAGREE"" WARNING, ""WOW INPUT"" CAUTION MESSAGE, ""WOW OUTPUT FAIL"" STATUS MESSAGE. THE MAIN GEARS BOTH SHOWED A DOWN INDICATION ON THE EDI AND THE NOSE GEAR SHOWED AN UP INDICATION. REMOVED & REPLACED NLG PISTON AXLE ASSY IAW JOB CARDS 200-32-21-20 & EO P32064. PERFORMED MULTIPLE GEAR RETRACTIONS/ EXTENSIONS IAW AMM 32-30-00, OPS CHECK GOOD. A/C OK FOR SERVICE.