As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TEST OF EQUIP COOLING SWITCH, FWD EQPT SMOKE MESSAGE ON EICAS DID NOT APPEAR AND SMOKE ANNUNCIATION LIGHT DID NOT ILLUMINATE. REMOVED AND REPLACED EQUIPMENT COOLING SMOKE DETECTOR T5164 PER AMM 21-58-19-002-042 AND 21-58-19-422-11 OPS CHECK GOOD.