As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, WITH THE LT PACK DEFERRED, THE RT PACK HIGH PRESS CAUTION MESSAGE ILLUMINATED. THE CREW RETURNED TO CLT. MAINTENANCE OPERATIONALLY TESTED THE AIR CONDITIONING SYSTEM IAW CRJ200 AMM 21-51-00-710-801. NO DEFECTS WERE FOUND. THE AIRCRAFT WAS RELEASED FOR SERVICE.