No way for the dealer to KNOW the PMD was good or bad, 1st thing try running on Diesel only, maybe you have some BIO sludge messing with optical, do you have to heat your bio, is it too cold/thick messing with operation.
I have a Helm but there is nothing I can help you with as far as Bio operation, try Diesel only and see if problem goes away, if you still have warranty coverage then you will want to be "Normal fuel" before going back to the dealer, PMD is a possibility, but lets get back to a normal configuration 1st, these trusk were never designed for bio even though they can run with it, your problem seems electrical but I just don't know with bio in the picture.