You may consider doing a serach here on injectors or scan the board.
In short, that being an LB7 engine, I suspect injectors. The less you spread fuel, the less damage it does to the coatings and wiring harnesses. I had to (also) have the entire wiring harness system replaced. It was saturated as diesel will dissolve most anything.
You can do a search on my screen name and find a few testimonies of my experiences.
Sorry about the problem. I think your warranty should cover this unless the timeframe of warranty has lapsed. I may be completely wrong about this issue that you have described but similar symptons that have been written about here have turned out to be said suspected problem.
Here's a pic of an enroute fuel dump that I experienced.
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