What was found
MIA - FLT 1327 - DURING TAKEOFF, FLIGHT CREW NOTICED SMOKE IN THE CABIN. FLIGHT AIR INTERRUPTED AND RETURNED TO MIA AND LANDED WITHOUT FURTHER INCIDENT. UPON LANDING, SMOKE DISSIPATED FOR THE CABIN. MAINTENANCE FOUND THE APU LEAKING OIL INTO THE AIR CONDITIONING SYSTEM. REPLACED APU AND RAN WITH PACKS ON WITH NO LEAKS OR SMELL NOTED. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)