If you REALLY want to know exactly what happened with your car, check with the local Worker's Compensation court/board. If the mechanic was really hurt as badly as you say, he almost certainly would have filed a Worker's Compensation petition. (If he hasn't he should speak to a comp attorney pronto). In the comp petition, he should have stated (under oath)how he sustained his injuries.
These records should be public records and should be available to you. If no comp case was filed, your local dealership (I mean "Ford Store") is probably full of sh!t.
I also agree with JaTo about using slash and burn tactics. Something tells me that an anonymous call to OSHA might force the dealership to come clean about what happened.
