I purchased a 2002 CLK 320 and seem to regularlyhave fuses poping. Fuses related to the seats seem to be partiucularly sensitive. Currnetly, I have an issue with the reat seat head rests. When I push the head rests control button on the dash, I can hear theactuator/motor running but theheadrest, that are currently in a full up position, will not retract? Any ideas on what the problem might beand what to do to fix it?