What was found
(CAN) AFTER ENGINE START AND GPU REMOVAL THE PASS DOOR, BAG DOOR, FWD DOOR, AND SERVICE DOOR LIGHTS WERE FLASHING, WE RECONNECTED THE GPU, AND SHUTDOWN THE BOTH ENGINES. LIGHT SMOKE WAS OBSERVED FROM THE LT NACELLE AIRCRAFT WAS DEPLANED. THE AMOUNT OF SMOKE INCREASED AND FIRE BOTTLES WERE DICHARGED AND ALL POWER SHUT OFF. FOUND THE 2431K1 RELAY SHORTED, RELAY AND STARTER REPLACED.