What was found
AFTER TAKEOFF, UPON GEAR RETRACTION, LOUD BANG HEARD IN NOSE WHEEL AREA FOLLOWED BY VIBRATION SOUND. RECYCLED GEAR. WHEN GEAR WAS UP AGAIN, SAME VIBRATION SOUND WAS HEARD. EXTENDED GEAR AND RETURNED TO AIRPORT WITH NORMAL GEAR INDICATION. FOUND STOP CABLE ON RIGHT NOSE GEAR DOOR BROKEN. REPLACED CABLE ASSEMBLY IAW DC9 AMM 32-22-01.