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I got the dealer to acknowledge the 2017 SB where they talk about cleaning the DPF. They will be doing that now and seeing what happens. All other EGR warranty items, along with new paid for manifold since it passed the pressure test, have been completed.
SB 18 31 700
If this does not work, off to an industrial cleaner who has worked on BMW's before. It appears they clean them all the time in the 18 wheeler trucking industry.
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