Took my E200 into main dealer because last weekend the seat belt tensioners activated as I went over a speed bump doing less than 10mph in a car park. They carried out a brief inspection but want the car for a couple of days as they could not find out the cause without apparently stripping the centre consul out. Their initial inspection took half an hour. The4y found nothing. They want to charge me £65 for finding nothing then another £? for stripping it to actually diagnose the problem. I told them to go whistle for the £65 as, even though its not under warranty (four years old) it is a safety issue and should be carried out FOC, especially as the air bags did not deploy. Had there actually been an accident there is now some doubt as wether they would have. Am I in the right for demanding this be carried out at no cost to me? As alway7s, many thanks in advance.