As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR CONDITIONING SYSTEM DISTRIBUTING A "SWEATY SOCK" AROMA. TROUBLESHOOT CABIN AIR QUALITY,26L00021002. APU SMELL IN CABIN AND 26L00021004- DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM (ENGINES AND APU). REPLACED APU. THE AIRCRAFT WAS GROUNDED.