As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MULTIPLE WARNINGS, CAUTION AND ADVISORY EICAS ANNUNCIATIONS ON TAKEOFF ALONG WITH AURAL WARNINGS. RETURNED FOR EMERGENCY LANDING. ALL ANNUNCIATIONS EXCEPT AURALS DISAPPEARED WHEN EICAS COMPUTER SWITCH MOVED FROM AUTO TO RIGHT. REPLACED FAULTY LEFT EICAS COMPUTER PER MM 31-41-02-4.