Have you tested the ECT sensor resistance in the pot of cold-to-progressively-warmer water test using your ohm meter and cooking thermometer and compared the results to the published temp vs resistance curve? About four data points between near-freezing and near-boiling should be adequate to make a comparison. You can interpolate everything in between.

I might add that in all the years I’ve been reading this forum I believe I’ve only heard about one failure of the Regina (Bendix) computer and that was due to water intrusion into the connector.