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There's all sorts of other reasons a DPF wont regen, do you know if any have been explored? namely charge air system and Injectors... From memory turbo actuation has to be behaving itself, you have to have sufficient vacuum created from the pump, which has to pass through the boost control solenoid sufficiently to actuate both the VGT and wastegate vacuum pressure cells any leakage in the pipework and/or cells will shut the ECU down from finding a 'required condition' status it needs to attempt regen... resulting in premature filling of DPF... Confirm boost control solenoid is piped up correctly too thats a more than common oversight, ive done it myself. Mechanical boost leakage (for example: hole in the intercooler, non-air tight inlet manifold, leaky boost pipe) can lead to the ECU shutting down regen capability too because the engine THINKS its getting good boost but the DPF is reporting silly pressure values due to a leak. post boost sensor. Boost sensor/MAP Sensor could also be reporting different values although within expected tollerance it could be out (hence it may not throw its own fault because its within tollerance). those values compared to the DPF Values could be shutting the ECU down. MAF sensor could be at fault for the same reason Lastly Injection system has to be upto par and no excessive back leakage from injectors. if you do have a leaky injector it may not show as excess soot out of the tailpipe. Theres been a few injector issues i know about recently both on here and people i know who have the diesels. I'd suggest looking at live injector correction values at idle, it would usually give a good indication if the ECU is dialing back some or overfueling others to compensate for a dicky injector, also take a look at Manifold pressures aswell as 'Desired' against 'Actual' boost figures would instantly show a dodgey/incorrectly installed boost control solenoid. MAP sensors read between 900-1100mbar with engine off this is normal, and you shouldn't be seeing much over 2600-3000mbar i wouldnt have thought (3000mbar is 2bar of boost and thats a lot in a standard trim car engine). hope this helps to separate the forest from the trees a little bit.