What was found
(CAN) EVIDENCE OF FIRE DAMAGE WAS DISCOVERED AFTER LANDING, OUTSIDE OF APU INLET LOCATION AND TAILCONE. CREW REPORTED THAT DURING DESCENT, THEY HAD TRIED TO START THE APU 3 TIMES WITHOUT SUCCESS. ON EACH ATTEMPT, THE APU SPOOLED ONLY TO 5 PERCENT AND 33 DEGREES C. THE THIRD TIME, THEY TRIED TO SPOOL UP THE APU FOR 2 MINUTES. AFTER EACH ATTEMPT, CREW ABORTED THE START MANUALLY. COMPOSITE STRUCTURE OF TAILCONE DAMAGED.