apart, remove the top from the base and the hi pres. check valve can be dissambled and cleaned. if that is the only problem, there is no need to disasemble the rest of the pump.
it would be good to replace the o ring on the check valve with one of better quality that will withstand the heat better. this is the o ring that went bad on mine real quick.
also, is good to clean all the crud out of the inside of the base
if you want to keep the pictures, save them, they only stay here for a week. if you wish to dissamble further, i have more pictures of the rest of the pump. john