2002 Buick regal LS steering problem

It started out as the ABS light came on and the power steering would go out when turning a certain direction. Mechanic's looked at it and said the modul went to default mode or something along that line. Get the car back, power steering acts up again but no ABS light this time. The car is currently at the garage and they are trying to get the ABS light to come back on again to scan. I think they are guessing between the power steering pump and the Rack & pinion. Any ideas? :banghead: