As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW RECEIVED RED HEADING FLAG WHICH IS A POSSIBLE AHRS PROBLEM PER MAINTENCE. DUE TO POTENTIAL EXTENSIVE DELAY IF CREW LANDED IN SHD ADVISED OVERFLY TO IAD TO GET THE PROBLEM RESOLVED QUICKER WITH LEAST AMOUNT OF PASSENGER INCONVENIENCE. REPLACED RT AHRS COMPUTER.