What was found
AFTER SELECTING GEAR LEVER UP NOSE GEAR REMAINED DOWN RECEIVED GEAR DISAGREE AND NOSE DOOR OPEN WRINGING MSGS C/W QRH ALL GEAR DOWN AND NORMAL LANDING. SMOOTH LANDING, LAND WEIGHT WAS 46,700. GEAR MESSAGES APPEARED, APPROX 10 SECONDS AFTER SELECTION. MANUAL RELEASE HANDLE USED. HYDS PUMPS IN AUTO THEN SELECTED TO ON AFTER QRH. EMERGENCY DECLARED. AIRCRAFT REMOVED FROM SERVICE. INSPECTED AND FOUND NLG SHOCK STRUT IMPROPERLY SERVICED. SERVICED NLG STRUT REF AMM SUPP 16-250A. C/W NLG SWING REF AMM 32-33-00. OPS CHECK GOOD. REF WO 342233 WORK CARD 4 FOR 24HR EXTENSION CHECK.