As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DEPARTURE, ACFT WOULD NOT PRESSURIZE. EICAS MESSAGE CARGO DOORS INDICATED AND CARGO DOORS LIGHT ILLUMINATED. ACFT RETURNED TO STATION. DURING INSPECTION FOUND AFT CARGO DOOR NOT CLOSED AND LOCKED. MANUALLY CLOSED AND LOCKED DOOR. OPERATED THE DOOR ELECTRICALLY TWO TIMES. OPS CHECKED NORMAL IAW AMM 52-35-00/201. NO FAULTS NOTED.