What was found
GEAR DISAGREE WARNING MESSAGE ON APPROACH TO LANDING. RE-CYCLED, SAME MSG, RAN QRC/QRH CHECKLIST. MANUAL GEAR EXTENSION SUCCESSFUL. UPON LANDING NOSEWHEEL STEERING INOP / REMOVED AND REPLACED PSEU. PERFORMED EXTENSION RETRACTION OPERATIONAL TEST AGAIN, NO FAULTS FOUND. ALL WORK PERFORMED IAW CRJ 900 AMM 32-61-01-400-801-A01, 32-31-01-400-802-A01, 32-30-00-710-801-A01.