As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIRTY MUSTY CABIN SMELL DURING TAXI-IN, AFTER TURNING ON APU BLEED WITH SINGLE ENG TAXI. FOUND THE TURBINE CAVITY VENT SEALS LEAKING. REPLACED IAW AMM 49-91-53. ALSO THE APU OIL COOLER WAS FOUND TO BE LEAKING & WAS REPLACED IAW AMM 49-91-44. PLEASE SEE AALA201509149007 FOR ADDITIONAL PART INFORMATION.