Calling out to all you backflow experts, anyone experienced this? I tested a Watts 3/4" 007 DCVA today. 1st check valve closed around 1.2 press. differential, but didn't close tight, slooowly leaking down to 0. 2nd valve didn't close at all. Replace both valves with new ones, got exactly the same results. Now, the system wasn't winterized, still not too sure why not, I think the installer might have dropped the ball. And it got relatively cold here this winter. It's only one year old, and the DCVA seems to have passed the test last year. Looks to me like I'll have to replace the whole thing, feel bad for the customer. Don't see any cracks or leaks in the body, could be something on the bottom (it's in the ground). Just thought I'd check if anyone has seen this before, or has any suggestions. Thanks.