What was found
GAUGE NORMAL AT START OF FLIGHT. WENT TO ZERO PRESSURE FOR ABOUT 2 HOURS AND RETURNED TO NORMAL. REMOVED GAUGE, FOUND SMALL HOLE IIN BELLOWS. REPLACED GAUGE, TEST NORMAL.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
GAUGE NORMAL AT START OF FLIGHT. WENT TO ZERO PRESSURE FOR ABOUT 2 HOURS AND RETURNED TO NORMAL. REMOVED GAUGE, FOUND SMALL HOLE IIN BELLOWS. REPLACED GAUGE, TEST NORMAL.