As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THRU 5000 FT WITH THE LT PACK DEFERRED, THE RT PACK HI PRESS CAUTION MESSAGE ILLUMINATED. DUCT PRESSURE WAS REPORTED >80 PSI. THE FLIGHT RETURNED TO CLT AND LANDED. MAINTENANCE COMPLIED WITH AN OPERATIONAL CHECK OF THE RT AIR CONDITIONING SYSTEM AND FOUND NO DISCREPANCIES. THE AIRCRAFT WAS RELEASED FOR SERVICE.