As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS SMOKE IN THE CABIN. EXTERNALLY LEAKING LOW OIL PRESSURE (LOP) SWITCH CAUSED OIL TO FLOW OVER LOAD COMPRESSOR CASE WHICH WAS REINJESTED INTO THE APU AND CAUSED ODOR OR SMOKE. THE APU (APS3200 SERIAL NUMBER 1413) WAS REMOVED AND ROUTED THROUGH SUNDSTRAND WHO CHANGED THE LOP SWITCH AND RETURNED THE UNIT TO SERVICE (CURRENTLY INSTALLED IN AIRCRAFT 4217).