What was found
AFTER TAKEOFF CLIMBING OUT OF 3000' ECAM ALERTED AVIONICS SMOKE. NO SNIFFER FAN SMOKE OBSERVED, ECAM CLEANED THE WARNING, AND A FEW SECONDS LATER. ADVISED AGAIN AVIONICS SMOKE. THIS SECOND ECAM ALERT PROMPTED EMERGENCY RETURN AND LANDED SAFELY 26L CYVR. INSPECTED AVIONIC BAY FOR PRESENCE OF FIRE OR BURNED COMPONENTS, NO FAULT FOUND. REMOVED AND REPLACED BOTH COALESCER BAGS. REMOVED AND REPLACED SMOKE DETECTOR POSITION 11WA, 12WA, 13WA.