DC Customs

I have the PDAS light come on after a short distance followed by the Abs light. When the ABS light comes on the brake pedal gives a little at the same time.
I have changed the ABS pump, accumulator,longitudinal valve, coils, and it has solid state accelerometers fitted. Bled all the brakes properly inc the diff valves. I have cleaned 3 of the speed sensors, the last ones bolt is seized in.

I had it scanned yesterday and comes up with fault code 44, does anyone have any idea what to check or change next?

Thanks
Darryn