What was found
FRG - AFTER TAKEOFF DURING CLIMB-OUT WHEN LANDING GEAR RETRACTED, NOSE WHEEL LIGHT REMAINED ON (DOWN AND LOCKED). PILOT CYCLED GEAR DOWN AND RETURNED TO FRG. MADE UNEVENTFUL LANDING. RETURNED AIRCRAFT TO MAINTENANCE FACILITY. JACKED AIRCRAFT. CYCLED LANDING GEAR UP. NOSE DOWN AND LOCKED LIGHT REMAINED ILLUMINATED WITH GEAR UP AND LOCKED. LIGHT EXTINGUISHED SELF AFTER 20 SECONDS. CLEANED AND LUBRICATED SWITCH PLUNGER. CYCLED GEAR FIVE TIMES. ALL INDICATIONS WERE NORMAL, OPS CHECKED OK. REMOVED AIRCRAFT FROM JACKS.