What was found
AFTER T/O RAISED LANDING GEAR AND NO GEAR CAME UP. SOUNDED LIKE POSSIBLE LOOSE TREAD. WITH HANDLE UP ALL 3 RED AND ALL 3 GREEN LTS ON. LOWERED HANDLE. ALL 3 LIGHTS IMMED WENT GREEN. NORMAL LANDING AT 146.2 REPLACED ALT GEAR EXT HANDLE DOOR SWITCH AND ACTUATOR PER MM 32. JACKED A/C FOR GEAR SWING. GEAR OPS NOW CHECKS GOOD. RESTORED A/C TO NORMAL. INSTALLED PRESSURE PANEL IN NOSE W/W. LDG WEIGHT BELOW MAX LDG WEIGHT. NO ACTION REQUIRED.