What was found
DURING APPROACH ONFLIGHT 4024 (CVG TO EWR) RECEIVED A GEAR DISAGREE "NLG" 20 - 30 SECONDS AFTER GEAR SELECTED DOWN. THE QRH WAS FOLLOWED, THE GEAR HANDLE WAS CYCLED AND ALL GEARS INDICATED GREEN. AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. REVIEWED CODES FROM APPENDIX 1 AND PSEU. INDICATIONS POINT TO NOSE LANDING GEAR SELECTOR VALVE. REPLACED NOSE LANDING GEAR SELECTOR VALVE IAW CRJ 200 AMM 32-33-10 AND ADJUSTED NOSE GEAR UPLOCK HOOK FROM .090" TO .200" IAW 32-33-05 PA 05-018J COMPLETED. PART NUMBER ON /OFF 750006000 SERIAL NUMBER ON 1514 SERIAL NUMBER OFF 0014T. LEAK CHECKS GOOD. COMPLETED FUNCTIONAL TEST PER 32-30-00-720-801 CHECKS GOOD.