IM THINKING OF BUYING A 1998 SLK230. THE CONVERTIBLE ELECTRICAL SYSTEM IS NOT WORKING SO IT HAS TO BE DONE MANUALLY. THE SELLER SAYS NO ONE WILL/CAN GIVE HIM AN ESTIMATE UNLESS THEY ARE ACTUALLY GOING TO DO THE WORK. HE SAID ONE GUY GAVE HIM AN APPROXIMATE FIGURE OF $1000 TO REPAIR. ITS A GREAT DEAL AND IN GREAT CONDITION OTHER THAN THAT. DOES ANYONE KNOW APPROX. HOW MUCH IT WOULD COST TO REPAIR THE ELECTRICAL PROBLEM WITH THE CONVERTIBLE TOP? IS THIS A COMMON PROBLEM?