As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT 17,000 FEET WE GOT THE INDICATION OF APU FIRE. THE APU ENGINE FIRE SWITCH WAS PUSHED. THEN THE BOTTLE WAS DISCHARGED AND THE APU FIRE INDICATION WENT OUT. WE DECLARED AN EMERGENCY AND LANDED IN TETERBORO WHERE THE FIRETRUCKS FOLLOWED THE AIRPLANE AND THEN CHECKED THE TAIL OF THE AIRPLANE TO VERIFY THERE WAS NO FIRE ON THE GROUND.