What was found
DURING TRANSIT CHECK, CAPTAIN REPORTED SMOKE IN PASSENGER CABIN. DURING MAINTENANCE CHECK IT WAS DETECTED OIL LEAKING IN THE ZONE OF LT PRIMARY AND SECONDARY HEAT EXCHANGERS AS WELL AS IN THE FLOOR ACCESS OF AIR CONDITIONED UNITS AREA. MAINTENANCE PERSONNEL REPLACE THE AUXILIARY POWER UNIT, PRIMARY AND SECONDARY LT HEAT EXCHANGERS, TURBINE ASSY COOLING, WATER SEPARATOR TEMPERATURE AND PNEUMATIC SHUTOFF VALVES IAW MM 49-10-00, 21-51-02, 21-51-03, 21-51-01, 21-20-03 AND 21-51-06 RESPECTIVELY, TESTED CORRECT.