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My experience is more with Ford, but I think that most manufacturers respond in a similar fashion. First, the possibility always exists that it was an isolated incident that will never happen again and you should always consider that.
Second, you may want to consider taking it to another dealer to see if one of their technicians could identify the concern. Fixing automobiles is more similar to a doctor diagnosing a patient than fixing a bike in that it is not really an exact science. You might take it to another dealer where this kind of an incident has already happened and they know how to address it. Also you may want to ask the level of certification of the technician looking at the vehicle. It may have been looked over by a technician fresh out of school when a seasoned Master Technician is in the next bay.
Lastly, if you are convinced that there is an issue (continues to happen), manufacturers always have field engineers who will go to your local dealer to look at the vehicle when there is a problem that the technicians at the dealer cannot fix/diagnose.
Hope this helps.