The pitot tube push-on connector leaked at the push-on; I removed, recut and reinserted the hose with no more leak. The balloon was still inflated four hours later when I checked, so I called it good. The allowance is 100' per minute or 1inHg differential at 1000' AGL for one minute, so holding pressure for four hours was my acceptable test criteria. I tested the AOA and Pitot lines separately.