As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CHEMICAL SMELL IN COCKPIT. MAINTENANCE FOUND SOME CONTAMINATION AT APU SURGE VALVE, DUCT AND LOAD COMPRESSOR. RAN PACK WITH ENGINES RUNNING. NO APU BLEED NO NOTICEABLE SMELL. FORWARD TO MCO/PLACARD. APU WAS REPLACED DUE TO SUSPECTED INTERNAL OIL LEAK LOAD CARBON SEAL. SYSTEM OPERATION IS NORMAL. MCO/PLAC REMOVED.