Originally Posted by Bob Weir

I'm not really sure how to test to see if the pump is actually running.
___Fluid will flow through resevour. Disconnect return hose from resevour, and continually add new fluid to flush system. It self purges any air in lines.

I don't know if the valve body is good or not ( are they really prone to failure? any other way to test?)
___Manual has procedures for presssure testing and as overnight procedure to ensure it's holding pressure. "Level controller" has very good rep for longevity.