What was found
SMOKE IN AFT AND F0RWARD CABIN AFTER LEVEL OFF AT 37,000 FEET. SMOKE BEGAN TO DISSIPATE AT 24,000 FEET IN DESCENT AND CLEAR AT 10,000 FEET. FLIGHT DIVERTED TO PHX. THE APU HAD A SEVERE COOLING FAN FAILURE WHICH CAUSED OIL TO LEAK INTO THE INLET PLENUM, CONTAMINATING THE AIR CONDITIONING SYSTEM. THE COOLING FAN HAD THE SHROUDED ROTOR. THE APU ALSO SUSTAINED FOREIGN OBJECT DAMAGE TO THE COMPRESSOR IMPELLERS. PART TOTAL CYCLES, 2,599.