As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT RETURNED TO BWI WITH AN UNEVENTFUL LANDING AFTER THE FLIGHT ATTENDANT REPORTED SMOKE IN THE CABIN ON CLIMBOUT. MAINTENANCE FOUND THAT THE APU WAS LEAKING OIL INTO THE INLET. PERFORMED DUCT BURNOUT OPN 5089 AND REPLACED BOTH COALESCER BAGS. LEAK CHECKS GOOD.