What was found
UPON SHUTDOWN, PILOT SMELLED SMOKE, SAW SMOKE COMING FROM NR1 ENGINE, OPENED COWLING SAW SMALL FIRE ON STARTER GENERATOR, RAN BACK TO COCKPIT ACQUIRED THE HANDHELD FIRE EXTINGUISHER, AND PUT FIRE OUT. DISCOVERED A BRAIDED OIL VENT LINE CAME IN CONTACT WITH THE TERMINAL ON THE STARTER GENERATOR, AND CAUGHT THE RUBBER PROTECTIVE BOOT OF THE STARTER GENERATOR ON FIRE. NO FURTHER DAMAGE.