High, Conumdrum here too, like OC Forums.
It's NOT the PC Ice, it's the aluminum in the CPU block reacting with the copper in th rest of the system. PC Ice doesn't have anti-corrisive properties. Thank goodness you got him figured out and will run cheaper smarter liwuids in the future and ge a proper CPU block for him.
You do quality stuff and sorry to hear about a rouge member giving you problems.