k bus issues

Ok im having k bus issues, my cluster back light doesnt work interior signals dont work sunroof rear defrost automatic adjusting passenger mirror air conditioning, clock on radio door ajar signal, among a few things, ive read all the post regarding this matter and have even tried out all the suggestions even to the point of removing the k bus from behind fuse box and testing each wire seperately to find the short. But no luck. Has anyone had bmw look at the issue and fix the problem if so what was the cost. Thank you