As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REJECTED TAKEOFF, AT 35 KNOTS DUE TO A MASTER CAUTION SPLIT IRS OPERATION WENT AWAY AFTER 30 SECONDS. FOUNDINGS CMC MESSAGE. PERFORMED THE OPS TEST; GROUND TEST OF ALL ADIRS SYSTEM AND THEN OPS CHECKED NORMAL. GROUND TEST PASSED, NOT DUPLICATED FAULTS IAW AMM 34-25-00/501.