As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT - FLT 1112 - FLIGHT RETURNED TO GATE WITH A COMPASS PROBLEM WHICH MAINTENANCE FIXED. FLIGHT PROCEEDED AGAIN AND AFTER TAKEOFF, THE NR 1 UNIT FAILED AGAIN. CREW DECIDED TO RETURN TO CLT. MAINTENANCE REPLACED THE NR 1 IRU. OPERATIONS CHECKED GOOD. (X)