What was found
NOSE GEAR RED LIGHT ILLUMINATION ON GEAR RETRACTION, NLG IND PIN WAS FLUSH. GEAR DOORS STAYED OPEN BASED ON AIR STREAM NOISE BELOW FLIGHT DECK. UPON RETRACTION MUCH NOISE & VIBRATION UP, DOWN & SIDE WAS FELT. QRH P.32.9 RED GEAR LIGHT WITH GEAR HANDLE UP WAS COMPLETED. AT ITEM 4 WE GOT NORMAL GEAR DOWN INDICATION & RETURNED. FOUND UPPER SHRADER VLV LOOSE & PACKING BLOWN. REPLACED PACK & SERVICED NLG STRUT IAW 32-21-02-3-0-0. PERFORMED RETRACT TEST IAW 32-20-00. OPERATIONS CHECKED NORMAL.