What was found
(CAN) ON STARTING NR 2 ENGINE, GROUND CREW ADVISED SMOKE STARTING TO COME FROM NR 1 ENGINE COWL OR LANDING GEAR. AT SAME TIME CABIN CREW WERE SECURING THE CABIN AND WERE INFORMED BY PASSENGERS OF SMOKE ON LT SIDE OF ACFT, INFORMED FLIGHT DECK. FIRE CREWS CALLED, AND ON THEIR ADVICE, RAPID PRECAUTIONARY DISEMBARKATION INITIATED THOUGH FRONT LT DOOR, ONLY. ON FURTHER INVESTIGATION, HYDRAULIC BRAKE FLUID FOUND IN AREA AROUND LT LANDING GEAR AND CONCLUDED THAT SMOKE CAUSED BY VAPORIZING HYDRAULIC FLUID. ON INSPECTION FROM ENGINEERS LEAK FOUND IN HYDRAULIC PIPE NEAR VICINITY OF BRAKE DISCS.