Advice or Experience with Mercedes MBE4000 Rebuild

My oil samples from OPS and an extra noise in number one cylinder indicate its that time. 1.1 K miles on a very dependable unit. Copper jumped from 12 to 44 ppm. #1 sounds different using steel bar to listen on cylinder wall. Anybody have advice, experience or "I wish I had" on a plan of attack. I know KR hates these engines. We've got three, 04 - 07, and nothing but good results. All in excess of 1 million. I've made the rounds to shops and others - all over the board with repair, replace suggestions. Have not taken any thing apart as of yet to explore further or spent any money with "experts". Jumped to another truck since having a driver retire.

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