What was found
FLT 6527 - SHORTLY AFTER TAKEOFF, THE F/A REPORTED TO THE FLIGHT CREW A PROBLEM WITH SMOKE IN THE CABIN. THIS WAS FOLLOWED BY A CREW ADVISORY MESSAGE (CAS) INDICATION SMOKE-LAV. FLIGHT CREW DECLARED AN EMERGENCY AND RETURNED TO COS. AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAX - MX INSPECTED THE AIRCRAFT AND DETERMINED THAT THE LT ENGINE HAD BEEN OVERSERVICED WITH OIL THUS, CONTAMINATING THE AIR CONDITIONING SYSTEM. ENGINES WERE RUN TO PURGE ENGINE OIL FROM AIR CONDITIONING SYSTEM. AIRCRAFT RETURNED TO SERVICE. (X)