As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE CREW REPORTED INTERMITTENT NR 1 ENGINE AND APU FIRE EICAS WARNINGS ALONG WITH A DAU NR 1 MISCOMPARE MESSAGE ON THE EICAS. MAINTENANCE REVIEWED A RECENTLY REPLACED DAU; ON REVIEW OF THE TEARDOWN REPORT IT WAS NOTED THAT THE UNIT WAS RETURNED TO SERVICE AS A NO-FAULT-FOUND FROM THE BENCH - PREVIOUS FAILURE WAS FALSE WARNINGS ON A DIFFERENT AIRCRAFT. MAINTENANCE REPLACED THE NR 1 DAU.