As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OFFENSIVE SMELL CONSISTENTLY COMING FROM THE AIR CONDITIONING SYSTEM WHEN REDUCING POWER AND DESCENDING OUT OF CRUISE ALTITUDE. REMOVED DIRTY CONDENSER BAG P/N 83237-12 AND INSTALLED CUSTOMER SUPPLIED NEW CONDENSER BAG PN 83237-12 RAN APU WITH NO ODER OR OTHER DEFECTS PRESENT AT THIS TIME, REF CE-560XL AMM 21-21-00.