Sure enough, I replaced the two hoses and codes were gone ...
However, I had disconnected the battery before removing the solenoid valve, and so I ended up with six monitors that needed to re-set before getting my state inspection. I used this driving cycle method: http://www.brickboard.com/AWD/volvo-1410555.html
After two of these driving cycles I still had all six monitors flashing - Bummer. I drove the car a few more times, not even doing the cycle, but figured I'd check the OBD for the heck of it ... All monitors re-set!
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1998 S70 T5, 5-speed, 190k
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