As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT 881 ON FLIGHT 5027 FROM CLT TO CVG. DURING CRUISE FLIGHT AFTER DEPARTURE FROM CLT THE NR 1 AHARS BECAME INOPERATIVE. NO EMERGENCY WAS DECLARED. AIRCRAFT RETURNED TO CLT AND LANDED WITH NO OTHER PROBLEMS. MAINTENANCE REMOVED AND REPLACED THE NR 1 AHARS UNIT. SYSTEM OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.