Don't discredit the fact that it could be one or all of a whole host of faults! With mine it started off with the heated washer jet wires shorting things out, fixed that only to find the switch was now knackered, fixed that only to find that the regulator was now jammed! A bit like buses, problems can come in multiples. Electric window regulators can be stripped down and regreased in about an hour/hour and a half easily. It's pretty straight forward.Best of luck, and enjoy the new car.