My F-350 Super Duty 2010 was losing ower, the turbo was not kicking in.
I took it to the dealer and after about a week they decided that there was a gasket between the turbos that needed to be replaced.
After they got in there they are saying that the head bolt is broken off.

What would cause the head bolt to break?

this is a 2010 truck with 201,000 miles. regularly serviced at the dealership.

Thanks!