As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WALL CONTAINING FLIGHT DECK DOOR MADE SEVERAL LOUD KNOCKS DURING CLIMB AS PRESSURIZATION INCREASED. DID NOT OCCUR DURING DECENT AS PRESURIZATION DECREASED. FOUND MISSING CATCH ON PRESURE RELIEF DOOR AT THE RIGID BARRIER SECTION 41. INSTALLED THE STAY IAW DRAWING 141T0619, DOOR FUNCTION RESTORED.