As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2397: OP FAIL STATUS MESSAGE. AIRCRAFT RETURNED TO GATE. MAINTENANCE REMOVED AND REPLACED NR 1 IOP. OPS CHECK GOOD IAW MTC 6314101. AIRCRAFT UPGRADED TO CAT III. COCKPIT PLACARD REFLECTS SAME AND MTX CONTROL WAS NOTIFIED. AIRCRAFT RETURNED TO SERVICE.