Look forward to an update!
I might be going the same route, I left MHD connected for about 30/45mins to watch the rail pressure and it went from 73.5 down to 31 down to 17psi. I read in one of the bmw university things that the residual pressure shouldn’t drop more than .5bar in 30 min time. Not sure if that was engine specific but right bow it’s my only lead.
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