Bought a 2004 C70 today, & suddenly the driver's power seat moves weirdly. some times works, but sometimes don't move and after 10 seconds it moves by itself while I was driving **;; Which part do I need to repair or replace? I took a look at it and I could hear frequent 'ticking' sounds under the seat ( where I can see many cables hooked & connected ...) Do I need to change some switches down there? Or how much is it gonna cost to fix it @ Volvo dealer ? Thank you