As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ITT FLUCTUATING BOTH READOUTS. RT ENGINE ITT NEEDLE AND NUMBERS ARE BOUNCING 75-100 DEGREES. ALL OTHER ENGINE PARAMETERS ARE NORMAL. AIR TURNBACK TO DTW. MAINTENANCE FOUND YELLOW HARNESS (ITT INDICATION) CANNON PLUG LOOSE AT ECU. TIGHTENED AS NEEDED, ALL CHECKS GOOD WITH ENGINE RUN.