What was found
UPON GEAR RETRACTION - THE NOSE GEAR UP LOCK KEPT TURNING ON & OFF NONSTOP AFTER APPROX 6-7 MINS- THE NOSE DOOR WARNING WENT OFF TWICE. THE GEAR UPLOCK CYCLED ON & OFF OR APPROXIMATELY 10-12 MINUTES THEN STOPPED. NO CODES IN PSEU. PERFORMED NLG SWING IAW CRJ AMM 32-30-00. GEAR SWING GOOD. DEFERRED IAW MEL. REMOVED AND REPLACED THE NOSE LANDING GEAR DOOR SELECTOR VALVE IAW AMM 32-22-20, ALSO REMOVED AND REPLACED THE CHECK VALVE IAW AMM 32-22-25.OPS, LEAK CHECK GOOD. REMOVED AND REPLACED THE NOSE LANDING GEAR DOOR SELECTOR VALVE IAW AMM 32-22-20, ALSO REMOVED AND REPLACED THE CHECK VALVE IAW AMM 32-22-25.OPS, LEAK CHECK GOOD. PERFORMED LANDING GEAR EXT/RET IAW AMM 32-23-01. OPS CHECKS NORMAL NO FAULTS NOTED. DM 29830 CLEARED, PLACARD REMOVED.