What was found
FLT - NR 651 - KPDX-KDAY - ON GEAR RETRACTION, A LOUD NOISE AND VIBRATION WAS NOTICED IN THE NOSE AREA. THE LANDING GEAR WAS RECYCLED WITH THE SAME RESULTS. RETURNED TO KPDX. MAINTENANCE INSPECTED THE UPLATCH FITTINGS, TRUNNION AND THE NOSE WHEEL WELL. NO DEFECTS WERE NOTED. (M)