As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MID 1 MAIN DECK CARGO SMOKE WARNING WITH NO VISUAL INDICATION OR ODORS IN FLIGHT. AN EMERGENCY WAS DECLARED ON APPROACH INTO MSP. REMOVED AND REPLACED RALTU AND REPROGRAMMED. PERFORMED DISPLAY AND INPUTS BITE TEST ON ECAM. WARNING WENT AWAY AND SYSTEM WORKED NORMALLY.