how to fix my henry hoover?

Hi, have been trying to fix my henry,have checked bushes they seem good not really worn have done test on most switches and cables for continuity have read other blogs on your site, about the terminals on the top winder they also look ok the only thing i can,t check is the little pcb but am reluctant to buy a new one in case it still doesn,t work read the plug blog to and that seems to be fine any ideas yours martin burnell