As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB A LOUD NOISE WAS HEARD COMING FROM THE RIGHT SIDE OF THE AIRCRAFT. SUSPECTING AN OPEN DOOR THE CREW DIVERTED TO PIT. MAINTENANCE FOUND THE OXYGEN SERVICING ACCESS PANEL (212BR) OPEN. THE PANEL AND FUSELAGE WERE INSPECTED IAW CRJ200 AMM 05-51-03-210-004. NO DEFECTS WERE FOUND. THE PANEL OPERATIONALLY CHECKED GOOD. THE PANEL WAS SECURED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.