What was found
DURING ROTATION AT GEAR RETRACTION, A LOUD NOISE FOLLOWED BY MODERATE VIBRATION WAS COMING FROM NOSE GEAR AREA. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND LEFT NOSE GEAR DOOR STOP CABLE BROKEN. REPLACED CABLE. ALSO, REPLACED FORWARD DOOR DUE TO DAMAGE INCURRED, OPERATIONAL CHECK NORMAL.