What was found
INSPECTION TYPE:N/A ATB - EMERGENCY DECLARED - MAIN CARGO DECK SMOKE WARNING MSG WAS DISPLAYED ON ECAM WHILE DESCENDING. ALSO RECEIVED AN AVIONICS SMOKE WARNING ECAM MSG. INSPECTED AIR COND BAY COMPONENTS, DUCTING, VALVES & DUCTING IN FWD CARGO BAY FLOOR, VLV'S & DUCTING IN LWR MID ZONE FOR DMG SIGN OF OVERHEAT & LEAKS. FOUND MID CABIN ZONE ISOL VLV STUCK IN CLOSED POS. REMOVED AND REPLACED PER MM 21-22-31-04. AIR VLV DFRD M340896 & CLOSED ON L/P 589229. REMOVED AND REPLACED TRIM AIR VLV PER 21-63-12. OPS TEST PERFORMED WITH APU AIR. FOUND NORMAL, A/C OK FOR RETURN TO SERVICE.