can you hear the pump motor running when you push an up button?
I had a bad pump in a '99 pace arrow. System ran and behaved perfectly, but just wouldn't lift the coach. Jacks would go to the ground and try, but no power. The motor didn't even sound like it was loaded, just spinning.
Autopsy showed that the pump rotor had ground a huge groove in the lower plate. Everything was working, but there was so much clearance the oil just bypassed rather than building any pressure.
After sometime trying to source individual parts or an entire pump (just the pump not the reservoir or electric motor) from powergear, I found a complete pump/motor/reservoir assembly on ebay at a price I was willing to pay.