As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MASTER WARNING AND FIRE BELL CONTINUOUSLY DISPLAYED ACTIVATED WITH NO ASSOCIATED EICAS OR STATUS MESSAGES. RESEATED MAWEA CARDS AND SYSTEM BITE TESTED OK PER AMM 31-51-00-715-014 AS PRECAUTIONARY REPLACE MAWEA PWR SUPPLY CARDS PER MM 31-51-01 AND C/W MM 31-52-00; OPS SYSTEM FUNCTION TESTED NO FAULTS NOTED. SYSTEM RETURN TO SVC.