What was found
AFTER TAKEOFF, GEAR WOULD NOT RETRACT. AFTER 4 ATTEMPTS GEAR HANDLE CAME UP AND GEAR RETRACTED, BUT RED "UNLOCK" LIGHT STAYED ON FOR 20-30 SECONDS, THEN WENT OUT. (NOISE AND VIBRATION WAS NOTICED COMING FROM NOSE GEAR). RE-PACKED NLG STRUT AND LUBRICATED NLG UPLOCK ROLLERS. SERVICED NLG STRUT AS REQUIRED. PERFORMED GEAR SWINGS WITH NO DEFECTS NOTED. WORK PERFORMED IAW MM 32-20-02 AND MM 12-10-38.