What was found
(CAN) AIR RETURN DUE TO FLAP DISAGREE, PAN PAN DECLARED, OVERWEIGHT LANDING. RESOLUTION CENTER FLAP/STABILIZER POSITION MODULE M839 REPLACED AND FUNCTION CHECKED OK, REF AMM 27-58-01, PB 401. SEE L5171130 FOR RECTIFICATION OF THE SYSTEM 2 NOSE GEAR AIR/GROUND PROXIMITY SENSOR TARGET AND FUNCTION TEST. TAKEOFF CONFIGURATION WARNING TEST CARRIED OUT OK, REF AMM TASK 31-51-00-725-302-0-01.