No idea, they couldn't work it out, everything else seems to be fine, no miss, no flat spots, nothing mechanically wrong with the car. It was lean mostly down low but all the figures were out to some degree.
Was told the wrong thing over the phone, ended up making 243.4kW@wheels and 430Nm of torque. Car feels back to normal, so while I'm a bit confused, I'm happy to have it back.
Still pretty good power for a td05 frame turbo on a 93t.
They managed to iron out a bit of a dip on the power curve too. I'll put a dyno graph up when I get a chance.