As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CONDITIONAL INSPECTIONAL FOR ODORS REF 05-51-26-800-801-C1, FOUND PC AIR FLAPPER STUCK PARTIALLY OPEN SUPPLIED PRESSURE TO THE PNEUMATIC SYSTEM WITH THE APU, TASK 36-00-00-860-803, PC AIR FLAPPER CLOSES NORMALLY AND DOES NOT LEAK. PC AIR FLAPPER IS NOT THE SOURCE OF THE ODOR.