What was found
NORMAL OPS, ODOR IN CABIN. DURING DESCENT INTO PHOENIX AT APPROXIMATELY 10-12,000 FEET, FLIGHT ATTENDANT NOTIFIED FLIGHT DECK OF STRONG BURNING SMELL OVERWING. SMELL IMMEDIATELY ABATED WHEN RECIRCULATION FAN TURNED OFF. PACKS WERE ON HIGH. REMOVED AND REPLACED RECIRCULATION FAN PER MM 21-21-22. LEAK AND OPS CHECK OK.