xserv cpu flatlining

I came across a xserv today that has been sitting at 100% cpu utilisation after being upgraded to 10.2.6, it has few services running and top shows only two servermanagerd processes at the top of the tree. It was upgraded 25 days ago and has flatlined at 100% since then. Its just used for file serving and users don't notice any degradation in performance... any help appreciated cheers bryan