[hcoles]

Well.. here is another update. They tried a bunch of strange approaches including pulling with two different pumps with hoses going to the same place.
Finally went back to the setup we had yesterday but had the same issue of going from 460 to 540 when turning the valve in an attempt isolate the pump and start the decay test.
We called Mitsubishi tech support and they confirmed the pump to 500 and then hold it for one hour specification. It is commonly done in the field. The spec. would not be as it is if it was very difficult to pass.
I'm not sure what is going to happen next. I suggested a few days ago that we try a process of elimination approach but they didn't want to do that.
I guess at some point they give up and I hire someone to come find the leak and take that money out of what I owe them.