ticking time bomb?

[Olfart]

My 2004 had 2 broken manifold bolts at about 47K miles. And one of them required removing the head in order to get to it. There was no hissing noise but they noticed the broken bolt heads while replacing the power steering pump and pitman and tie rods. Luckily it was all covered by the extended warranty I purchased when I bought the truck with 34K on it. They had the truck for a week and it even paid for a rental car.
Since it was warranty I have no idea of the cost to repair.