What was found
(CAN) SHORTLY AFTER TAKEOFF THE CREW REPORTED AND AVIONICS SMOKE WARNING AND RETURNED LANDING APPROXIMATELY 6000KG OVERWEIGHT. PAN PAN DECLARED. AEVC REPLACED IAW AMM 21-26-34, PB 400 AIR INLET 21HQ REPLACED IAW AMM 21-26-54, PB 400 AEVC TESTED OK MESSAGE CLEARED C/S SMOKE DETECTION SYS SIGNED AEVC OFF 87292325V04, SN 325 ON 87292325V04, SN 834 INLET VALVE 21HQ OFF 36DM2L ON 1RX1K2.