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I'd take a good look at the ends of those broken bolts and make sure the garage didn't break them trying to tighten them up, thinking he had found the problem.
Don't think I've ever seen a broken manifold bolt break on it's own on a vehicle that new.
It is not common, despite what the mechanic said, at least not on something with that kind of mileage at that age.
And, by the way I've never had to pull a head to remove broken manifold bolts. The exhaust maniflod will have to come off though.
Unfortunately there is no recall or bulletins on this, sorry.
Hope this helps.
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