hi ive had severe problems since i got my boxster with electrics. my roof only works when it wants to and stops halfway up or down sometimes, my heater is only blowing out look-warm air, the alarm goes off when ever it wants while both keys don't work and the demister for the front window doesn't work. any ideas because ive been told that it would cost me £500 just to have a porcshe dealer look at it never mind do anything and no garage here will touch it. a friend in need.