As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TWO TIMES DURING CRUISE FIRE BELL SOUNDED 1-2 SECONDS; NO FIRE OR SMOKE INDICATIONS, NO EICAS WARNING, ALERT OR FIRE LIGHTS. NO FAULTS NOTED IN CMC. RAN CMC GROUND TEST FIRE PROTECTION. TEST PASSED AND OPS CHECK NORMAL. REF AMM 26-11-00.