As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DTW - FLT 3106 - AFTER DEPARTURE FROM DTW, THE NR 1 ITT GAUGE BEGAN FLUCTUATING AND READ 300 DEGREES LESS THAN NR 2. THE AIRCRAFT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE PERSONNEL REPLACED THE NR 1 ITT INDICATOR. ALL SYSTEMS OPERATED SATISFACTORILY. (X)