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Surprise, it indeed was the heat exchanger. Replaced and solved the issue.

I had the same "squeak" when transitioning from gas to electric. I recently purchased a used 2021 F150 3.5 L Powerboost Hybrid (22K miles) and it has been at the dealership for over a month as the dealership has been working with Ford Engineering (if you can believe that) to diagnose. Finally...