What was found
AFTER TAKEOFF FROM ZFP, THE LEFT MAIN LANDING GEAR WOULD NOT RETRACT. THE CAPTAIN ATTEMPTED TO RAISE AND LOWER THE GEAR SEVERAL TIMES, BUT THE GEAR LIGHT STILL SHOWED RED. SINCE THE GEAR STILL WOULD NOT RETRACT, THE CAPTAIN RETURNED TO ZFP. AIRCRAFT WAS FERRIED TO OPF FOR MAINTENANCE. MAINTENANCE REMOVED AND REPLACED THE GEAR-UP SWITCH FOR THE LT MLG. MAINTENANCE PERFORMED A GEAR SWING AND AN OPERATIONAL CHECK ON THE GROUND WITH NO DEFECTS NOTED AT THIS TIME. (X)