As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT TRANSIT CHECK WAS DETECTED THE ENGINE FIRE ALARM SYSTEM DID NOT CANCEL AURAL WARNING. DURING REVISION RIGHT ENGINE LOOP B, BREAKER B-1 AND AMPLIFIER A2-6 WERE WITH DAMAGES. THE DUAL CONTROL UNIT WAS REPLACED IAW MM, ALL TESTS CORRECT.