What was found
IN FLIGHT BOTH CAPTS AND F/O COMPASSES TUMBLE. AIRCRAFT RETURNED TO DFW. REPLACED BOTH AHARS UNITS AND SYS OPNS NORMAL.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
IN FLIGHT BOTH CAPTS AND F/O COMPASSES TUMBLE. AIRCRAFT RETURNED TO DFW. REPLACED BOTH AHARS UNITS AND SYS OPNS NORMAL.