Hello. I have a Hoover WindTunnel Model U5472-900 (WindTunnel Supreme style) that I'm having a problem with. The vacuum says that the switch should be in the down position when it is turned off, but my vacuum turns on when the switch is slid halfway down and cuts out, and wont turn on when it is all the way down. Do I need to replace the switch? Also, the dirt sensor light stays on dirty all the time. Can I fix this, or would I be better off taking it to the Vac Shack?