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More subtle purge valve leak was my culprit. Leak was out the top and I tried a new cap first. Didn't leak after I added coolant and purged system following Bentley Manual procedure but later leaked again after a 15 minute drive.
I bought a Harbor Freight coolant system pressure tester, hooked it up, pumped up to 15 psi, and could hear a slight leak. I couldn't see any fluid so at first thought it was my test set up. Then I pushed on the area around the purge valve and the noise changed. All eight bolt head screws around the purge valve were loose so I tightened them up and now holds 15 psi.
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