As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER APU SHUTDOWN PILOT OBSERVED SMOKE COMING FROM TAILCONE JUST PROIR TO ATTEMPTING REFUEL. REFUEL PROCESS ABORTED AND REARBAY ACCESS DOOR OPENED TO INVESTIGATE. CREW MEMBER OBSERVED DENSE WHITE SMOKE COMING FROM REAR BAY. FURTHER INVESTIGATION REVEALED A SPLIT IN THE FUEL MANIFOLD FOR THE APU. SBT62T49108 ADDRESSES THIS PROBLEM, HOWEVER IT IS ONLY AN OPTIONAL BULLETTIN.