As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN APU BLEED IS SELECTED ON, THE CABIN FILLS WITH FUMES AND HAS A SWEET ODOR. MAINTENANCE INSPECTED FOUND APU OIL LEAK. P/C C/B N-8 ON RT MAIN BUS. AUXILIARY POWER UNIT FACT 27FEB16 18:15 MDT GROUND RAN APU FOR 1.5 HRS WAITING FOR PUSHBACK. NO SIGNIFICANT OIL LEAK NOTED. NO ODOR FROM BLEED. SUSPECT GLYCOL IN INTAKE.