Marriage is not worth returning. Before anyone asks I tested continuity at the solder joints by placing the faulty board on a breadboard, placing the PTO on a resistor, placing a negative probe in a row under each pin, touching the terminals and getting continuity. The defective board returned 0.02 per test. Using the correction factor *.0002953 I got 30.12 and 30.08 inches of mercury.
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