My BIL spent 23 years in the AF as a jet engine mechanic, got out and did 20 something with Honeywell. Anyway this is what he says. Probably a bad over temperature sending unit...seen this before when I was in the AF. That's a pathetic A&P mechanic if he can't figure that out. They will get a computer disagree code for it eventually. Mechanics these days don't know how to troubleshoot a problem, they need a computer to diagnose for them.
This sounds likely. I have a bit of GE and Allison experience, and bleed air isn't an uncommon problem. The fact that it comes in after leveling off is key. Could be temperature related, and could be the harness is being affected by the change in flaps. Chase grounds, cannon plugs, and the sensor first.
Is it calculated or measured?
