As mentioned in my previous post you may have an air leak that you have missed........being a Volvo MAF it should not be ready yet for replacement as you know!
When they replaced the turbo they may of damaged the MAF as the pic. says or damaged the PCV forcing an air leak especially where the nipple is forced into the rubber bung on the intake pipe!
The ECM-6805 still points to the TCV boost pressure fault being too much boost........perhaps when fitting the new turbo again they set the Base Boost setting to high for the ECU tolerances!
If your MAF at fault then why no indication whatsoever of a MAF code which is down among the ECM-1300`s ??
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