got my check engine light this morning in traffic

[Black_H3]

My head cacked at about 19k miles. I am over in Gmbh and can't get to my vin # right now but I know my Hummie rolled off the line in Sept 05', so it was one of the first, and like I said in another post my Hummer Dealer has seen a lot of the first ones with these "weak" heads and customers cracking them because of either towing, or high stress on the engine. He took 4 days to do mine, but I also had him do the 20k service and fix a rattle in the rear passenger door. I know he also replaced some other parts on the engine, but can't recall what they where.
When I get back to the states will get my paperwork and see what else he replaced, but all I know is my mpg almost doubled after I got it back.