What was found
UPON RESTART OF APU, THE FADEC MSGS CAME BACK, ALONG WITH A NEW MESSAGE, TAIL CONE BLEED LEAK. WHEN SELECTED THE APU AIR, THERE WAS A STRONG BURNING ODOR IN THE COCKPIT, SHUTDOWN & INSPECTED. CHECKED APU OIL LEVEL & PERFORMED A GENERAL INSPECTION OF THE APU. NO DEFECTS NOTED. PERFORMED APU INLET BORESCOPE INSPECTION AS REQUESTED. FOUND NO SIGNS OF OIL OR OTHER SIGNS OF FOD. INSPECTED APU & ACFT BLEED SYS FOR LEAKS. COMPLIED WITH APU START PROCEDURES & OPERATED 1 & 2 PACKS. MONITORED TAIL CONE BLEED TEMPS VIA DAU. PERFORMED AIR CONDITIONING & BLEED SYS OPERATION CHECK WITH THE APU & ENG BLEED AIR. ALL TEST PASSED, NO SIGNS OF FOUL ODORS.