What was found
MIA - FLT 1246 - EN ROUTE MIA/LGA, CREW NOTICED SMOKE IN CABIN. AIR INTERRUPTED AND RETURNED TO MIA. LANDED WITHOUT INCIDENT. REPAIRED APU OIL LEAK, ACCOMPLISHED PACK BURN, PERFORMED FCF. REPLACED BOTH WATER SEPARATOR BAGS. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)