What was found
AFTER TAKEOFF AND GEAR UP SELECTED WE RECEIVED GEAR DISAGREE N CAS MSG. BASED ON NOISE LEVEL WE BELIEVE THE GEAR WAS UP. RAN CHECKLIST INCLUDING LANDING GEAR WILL NOT RETRACT WITH (BLACK AND YELLOW BOX WITH SLASHED LINES). GOT THE GEAR DOWN SUCCESSFULLY WITH 3 GREEN DISPLAYED. DIVERTED TO MX SITE AND LANDED UNEVENTFULLY. CORRECTIVE ACTION: REMOVED SUSPECTED NOSE LANDING GEAR UPLOCK SWITCH PN: S3177-1 NSN AND REPLACED WITH CUSTOMER SUPPLIED NEW SWITCH PN: S3177-1 NSN. PERFORMED ADJUSTMENT OF SWITCH AND PERFORMED OPERATIONAL TEST. PERFORMED GEAR SWINGS MULTIPLE TIMES WITH NO DEFECTS NOTED. ALL INDICATIONS WERE NORMAL, OPS CHECKS GOOD NO DEFECTS NOTED. REF CE680A AMM 32-32-10