As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A LEFT & RIGHT HAND PACK HIGH PRESSURE MESSAGE ALONG WITH AN APU OVERTEMP MESSAGE ON CLIMBOUT. CREW FOLLOWED THE QRH AND RETURNED TO CLT WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE PRESSURE REGULATING VALVE IN ACCORDANCE WITH THE AIRCRAFT MAINTENANCE MANUAL. AIRCRAFT WAS RELEASED FOR SERVICE.