What was found
EWR - FLT 4001 - AFTER TAKEOFF, THE TAIL SKID LIGHT REMAINED ON. RECYCLED GEARS, LIGHT STILL ON. RETURNED TO EWR. CLEANED MOISTURE, OIL AND CORROSION FROM SWITCHES. OPERATED TAIL SKID SEVERAL TIMES AND VERTIFIED OPERATION PER MM 32-61-01, NO DEFECTS NOTED. (W)