FYI, suddenly had one EGT clearly reading very high right from right after startup (only 72 hours since new).
Spoke with tech support and, among other suggestions, they mentioned that the fast-on connectors from the probe to thr harness could get corrosion or otherwise screw up the electrons. This was possible even though sealed with heat shrink.

Out of curiosity, I replaced the two fastons with butt splices. Surprise, The probe is now working normally.

Of course I now have a new EGT probe coming in the mail. I guess I can use it for future date.

Tom Hanaway