Seems to be a weak link on these 10 yr car with say 200k plus... Simple enough to remove and have pressure tested, for hardenss and straightness as well... only take the troubled head of, naturally... then replace as you would any other alloy head motor... heaps of data on net for diy re: timing belt and tensions etc.. Since it is common, seems a good way to pick up a bargain, once repaired you know what u got, all fresh and clean to go.. not bad and it's just nuts and bolts if your familiar with that sort of thing, it's doable. Care with cleaning out ALL fine alloy particles after head shave if water jacket has to be welded... My radiator was 80% blocked...10K after head job with alloy particles caused to re-heat.. lets us know progress, I interested.