i used to cover airline and Part 91 corporate operators with on site engine performance and support before retirement. I
can attest that a mismatched parameter will drive operators bonkers. Especially a pair of engines
with matching parameters Before OH thaa come back mismatched after OH.
From your information I would guess that one of the ITT harnesses is the culprit.
I'd suggest bench check harnesses if BC available or swap one or both to identify bad harness.