As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MASTER WARNING FUSELAGE DOOR IN FLIGHT AT FL 190. SERVICE DOOR INDICATED OPEN IN FLIGHT. PRESSURE BUMP WHEN DOOR OPENED, THEN PRESSURIZATION NORMAL FOR REST OF FLIGHT. DIVERTED AND ACCOMPLISHED UNEVENTFUL LANDING. RIGGED THE VENT DOOR MECHANISM OF THE AFT SERVICE DOOR. OPS CHECKED GOOD. PRESSURIZED ACFT IAW MOM, NO DEFECTS NOTED. RETURNED TO SERVICE.