As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PUNGENT ODOR - SMOKE IN AIRCRAFT (PNEUMATICS SUPPLIED BY APU ONLY). WITH ENGINES RUNNING, IT BECAME WORSE. PROBLEM WAS NOT RELATED TO THE APU. CLEANED APU INLET AREA DUE TO FUEL, OIL AND SKYDROL CONTAMINATION. REPLACED ALL THREE COALESER BAGS. NO ADDITIONAL COMMENTS.