As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BUR - SMOKE IN CABIN AFTER LANDING AND THE APU AIR SWITCH WAS SELECTED ON. UPON REACHING THE GATE, THE APU WAS TURNED OFF AND SMOKE DISSIPATED RAPIDLY AFTER DOORS OPEN. REPLACED COALESCER BAGS FOR LEFT AND RIGHT AND PACKS. FOUND APU OIL RESERVOIR EMPTY AND LOWER FUSELAGE WET WITH OIL. CLEANED FUSELAGE AND SERVICED APU. SYSTEM GROUND CHECKED NORMAL OPERATION.