As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT IN FLIGHT THE EMERGENCY PRESSURE VALVE ACTIVATED INTERMITTENTLY. THE MAINTENANCE VENDOR TROUBLESHOT AND DETERMINED THAT THE AIR CYCLE MACHINE OVER TEMP SWITCH WAS FAULTY. THE VENDOR REMOVED THE DEFECTIVE SWITCH WITH A NEW SWITCH. OPERATIONS CHECKS WERE SATISFACTORY. THE AIRCRAFT THEN WAS RETURNED TO SERVICE.