As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB COPILOTS EADI WENT BLANK, MAINTENANCE CONTACTED AND AIRCRAFT RETURNED TO ANC. ON LANDING EADI STARTED WORKING NORMAL. MAINTENANCE SWAPPED AHARS COMPUTERS AND PERFORMED INITIAL BOX PROGRAMMING PER AMM. SUSPECT COLD WEATHER.