What was found
WAS ON APPROACH INTO KMCW WHEN FO FLYING CALLED FOR GEAR DOWN. GOT A GEAR DISAGREE WARNING MESSAGE AND NOSE GEAR DID NOT COME DOWN.PERFORMED QRH PROCEDURE FOR GEAR DISAGREE WARNING AND NOSE GEAR STILL DIDN€™T COME DOWN.DECIDE WITH CRM AND TEM TO DIVERT TO KDSM THAT HAS MORE EMERGENCY EQUIPMENT.PULLED LANDING GEAR MAUNUAL RELEASE HANDLE AND ALL GEAR CAME DOWN LAND LOCK. (FLIGHT 5139 - FILED CLOSED) TROUBLESHOT NLG GEAR DISAGREE WARNING MESSAGE IAW CRJ200 FIM 32-60-09 AND FOUND NLG SELECTOR VAVLE ASSY TO BE AT FAULT ,PROCEEDED TO REMOVE AND REPLACED NLG SELECTOR VALVE ASSY IAW CRJ200 AMM 32-33-10. OPS CHECK GOOD, NO DEFECTS NOTED, NO LEAKS NOTED. PREFORMED MULTIPLE NLG EXTENSIONS AND RETRACTIONS IAW CRJ200 AMM 32-30-00. NO DEFECTS NOTED, OPS CHECK GOOD ,CHECKED ALIGNMENT OF NLG UPLOCK PIN IAW CRJ200 AMM 32-33-05. NO DEFECTS NOTED, OPS CHECKED GOOD, ALSO PREFORMED INTERNAL LEAK CHECK PRESSURE DECAY RATE TEST IAW CRJ200 AMM 29-10-00. NO DEFECTS NOTED