What was found
AFTER TAKEOFF ON FLIGHT 4232 FROM DTW ONE SECOND AFTER THE GEAR COMMANDED UP, THE MASTER WARNING FOR GEAR DISAGREE AND NOSE DOOR OPEN CAME ON. QRH COMPLETED GEAR OPERATED NORMALLY DOWN. THE CREW PERFORMED AN AIR RETURN TO DTW. REMOVED AND REPLACED NLG SNSR HARNESS ASSY. P/N:300874-0205 (ON), COMPLETED PA 05-018J SCENARIO NR 1, COMPLETED GEAR SWINGS & OPS CHECK'S. ALL CHECKS GOOD AT THIS TIME. REMOVED NLG W/W NR 2 EXTENDED HARNESS, P/N OFF 17300-205 S/N OFF: 5-1082, IAW CRJ200 AMM 32-61-25.