The one time I had a problem that couldn't be diagnosed or fixed Acura kept the car for 4 weeks and had company engineers come to take a look. They actually used the experience to implement a TSB. The problem had to do with a weld around the moonroof making a loud popping noise over bumps. I was told it was not welded correctly but this was not a structural weld and there was no safety issue - it was just annoying. If they can't figure it out is there not some method of calling-in corporate to help?