So, I had some time to play with the car today and:
1) The error that is raised by the MAF sensor is "ECM-0039 Boost pressure control - flow to high"
2) I made some screenshots of the new BOSCH MAF in VIDA, the blue curve is the desired value, the green curve is the actual value
3) For some reason, I don't remember why - probably someone told me, I checked the "dynamic pump setting" and the values are 3-4 degrees off. Could that be the reason for the ECM-0039 fault?
4) I checked the hoses, everything seems to be tight, no leakage found...