As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - INFLIGHT LGA TO DFW, AFTER TAKE OFF STRONG BURNING FLUID SMELL WAS NOTED IN COCKPIT. F/A REPORTED SMOKE IN CABIN. AIR INTERRUPTED TO JFK AND LANDED WITHOUT INCIDENT. FOUND INTERNAL AND EXTERNAL OIL LEAK ON AUXILLARY POWER UNIT. REPLACED APU. SYSTEM GROUND CHECKED NORMAL OPERATION.