As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED DIRTY SOCK SMELL & SOON AFTER LOSS OF BOTH AIR CONDITIONING PACKS. ANNUNCIATOR LIGHT PRESSURIZATION FLOW ALSO ILLUMINATED. EMERGENCY DECLARED FLIGHT RETURNED & LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. REPLACED BOTH SINGLE SECOND SEGMENT CLIMB SWITCHES & BOTH COLESCER BAGS. SYS GROUND CHECK NORMAL OPERATION CLOSED.