As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOI-AFTER TAKEOFF FROM BOI ELEVATOR FEEL TRIM CAUTION LIGHT ILLUMINATED. ALL FLIGHT INSTRUMENTS ON CAPTAINS SIDE BECAME NON-FUNCTIONAL. AIRCRAFT RETURNED TO BOI WITH OUT FURTHER INCIDENT. REPLACED NR 1 AHRS. OPERATIONAL CHECKS NORMAL. AIRCRAFT RETURNED TO SERVICE.