As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AIR CONDITIONING SYSTEM GAVE OFF A FOUL ODOR. DEFERRED THE RIGHT AIR CONDITIONING SYSTEM IAW THE MEL 21-2. OPERATIONAL CHECKS OF THE RIGHT AIR CONDITIONING SYSTEM WERE LATER PERFORMED, NO DEFECTS WERE NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE WITHOUT ANY FURTHER PROBLEMS.