As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH EEC ALTN LIGHT ILLUMINATED. CDU BITE TEST FOUND ADIRU NR 1 (LT) FAULTY. REMOVED AND REPLACED SAME PER AMM 34-21-01. ALL CHECK NORMAL. ROTABLE PARTS CHANGE WAS INDICATED - TT 1445854, S/N OFF 01549 UNIT, ADIRU, AI OFF 29-3421-9-0002 1549, ON 29-3421-9-0010 0979.