As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 8202 JUN TO SIT, FLT NR 7203 SEA TO KTN AIR TURN BACKS: NR 2 AHRS (ALTITUDE AND HEADING REF SYSTEM) WITH EFIS COMP ( ELECTRONIC FLIGHT INSTRUMENTS SYS FAULTED). FLT NR 8203 AHRS CONNECTIONS CLEANED AND RESECURED, SYSTEM OPERATED NORMALLY FOR 3 STOPS. FLT NR 7203 AHRU REPLACED (ALTITUDE AND HEADING REF UNIT). REF NR 45982, 86. (K)