As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, WITH THE LT PACK MEL'D, THE RT PACK HIGH PRESS MESSAGE ILLUMINATED. THE CREW FOLLOWED THE QRH AND RETURNED TO DCA. MAINTENANCE OPERATIONALLY CHECKED THE RT PACK IAW CRJ200 AMM 21-51-00-710-801 AND WAS UNABLE TO DUPLICATE THE DISCREPANCY. NO DEFECTS WERE FOUND. ALL OPS CHECKS WERE GOOD. THE AIRCRAFT WAS RELEASED FOR SERVICE.