What was found
WHEN SELECTING THE GEAR UP AFTER TAKEOFF RECEIVED NOSE DOOR OPEN WARNING FOLLOWED BY A GEAR DISAGREE WARNING MESSAGE. QRH CLEARED MESSAGES. RETURN TO FIELD. (FLIGHT 4739 FILED CLOSED)C/W PSEU FAULT LOG AND FOUND S23 FAR IN FLIGHT. INSPECTED NLG AND FOUND S23 (NLG OLEO CENTERED/EXTEND) SENSOR AND MOUNTING BRACKET DAMAGED. REMOVED AND REPLACED WOFFW #2 HARNESS ASSEMBLY AS WELL AS THE NLG OLEO CENTERED/EXTEND SENSOR MOUNTING BRACKET PER CRJ200 AMM 32-61-05 AND AMM 32-61-05. COMPLIED WITH RETRACTION AND EXTENSION OF THE NLG PER CRJ200 AMM 32-30-00. NO DEFECTS NOTED. PERFORMED OPERATIONAL CHECKS OF THE PROXIMITY SENSOR SYSTEM PER CRJ200 AMM 32-61-00 AND OPERATIONAL CHECKS OF THE NOSEWHEEL STEERING SYSTEM CRJ200 AMM 32-51-00. ALL OPERATIONAL CHECKS GOOD AT THIS TIME.