What was found
AFTER SELECTING GEAR UP ON TAKEOFF, NOSE GEAR INDICATED UNSAFE, TWO RED LIGHTS. CYCLED GEAR TWICE AND GOT SAME INDICATION. JACKED AIRCRAFT AND CYCLED GEAR, ALL INDICATIONS AND RETRACTION NORMAL. CHECKED UPLOCK HOOK RIGGING PER MAINTENANCE MANUAL, CHECKED GOOD. FOUND UPLOCK ROLLER DRY, LUBED UPLOCK ROLLER AND HOOK. ALSO, SERVICED NOSE STRUT WITH HYD FLUID AND N2. CYCLED GEAR SEVERAL TIMES, GEAR RETRACTION AND DOOR OPERATION NORMAL.