As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKE-OFF, CREW SMELLED AN ODOR IN THE AIRCRAFT. SUSPECTED THE AIR CONDITIONING SYSTEM SINCE THE SAME HAD HAPPENED EARLIER IN THE DAY AFTER WHICH THE PROBLEM WAS CLEARED BY MAINTENANCE. TURNED OFF THE SYSTEM AND RETURNED TO BASE. DISCOVERED AIR CONDITIONER COMPRESSOR CLUTCH HAD FAILED. AC COMPRESSOR WAS REMOVED AND REPLACED WITH OVERHAULED COMPRESSOR.