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pump is not bad most time either your have bad power steering rack or there is switch for vacuum only if your steering has wires and I think on v8 what you have you do have wires on rack and you have dstc button on dash that would indicate than either no power supply to load solenoid on rack or wiring switch control
if you have dstc you have wires there all way on top and will help get better turning if the shop don't know only way is to go Volvo dealer to test wires
but problem is most time in wires or switch control for steering rack
if you can rate the answer positive you can still talk to me just makes it easier to reply faster back to you thanks
also when you car is off key out you pump brakes they get very hard now you turn key not start the car do your brakes sink feel software or stay same hard like rock ?