As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING OUT THRU 17000 MCD SEAL BLEW OUT AND CABIN PRESSURIZATION WAS LOST. AIRCRAFT RETURNED TO ATL AFTER T/O. EMERGENCY DESCENT PERFORMED TO A LOWER ALTITUDE. REMOVED AND REPLACED PASSENGER DOOR SEAL IAW CRJ200 AMM 52-11-10, OPS CHECK GOOD. SDR CLOSED.