Does anyone have any suggestions for maintenance of a pressure switch? Mine sticks sometimes. Pressure goes to zero, usually when I'm in the shower of course. I go out. Take cap off. And bump one of the switches, usually by lifting off contact and letting it spring back, using a non-metallic probe of course. This is enough to get pump back working. Should I: file contacts with nail file, spray everything down with WD40, blow switch out with air, etc? Any suggested fixes are appreciated. Problem seems to be getting more frequent.