Turned out to be easy. Chucked it in a vise, opened the back carefully with a screwdriver and simply cleaned the connections and contact points, regreased where necessary. Tapped it back together. Give it a try. Did my ragtop lift and retract switch as well- that one I had to make a little part for it out of a ballpoint "clicker" section to have a spring loaded, non conducting rocker for the contacts. Works fine.
Mike
