As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OILY SMELL WHEN RIGHT PACK IS ON, SOUR SMELL, WET DOG SMELL. ++RAN RIGHT PACK ON APU, NO OIL SMELL FOUND, SMELLED SOUR ODOR ONLY. PERFORMED REMOVAL OF OIL CONTAMINATION FROM THE AIR CONDITIONING AND PNEUMATIC SYSTEMS IAW AMM TASK 21-00-21-102-030 SUBTASK 21-00-21-862-042 NO AIR CONTAMINATION DETECTED DURING THE RIGHT PACK OPERATION.