What was found
(CAN) CREW REPORTED ON APPROACH SMOKE STARTED COMING OUT OF THE VENTS BEHIND F/O IN THE COCKPIT. SECONDS LATER F/A CALLED AND REPORTED SMOKE IN THE GALLEY AREA AND MID CABIN AREA THROUGH VENTS. INSTRUCTED F/A TO PULL ALL CIRCUIT BREAKERS IN THE GALLEY, WHICH SHE COMPLIED AND SOON AFTER THAT THE SMOKE STOPPED COMING OUT OF THE VENTS.