As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKE OFF, A/C FAILED TO PRESSURIZE. A RUMBLING SOUND WAS HEARD FROM BENEATH COCKPIT FLOOR. FUEL DUMP OF 4000 LBS CARRIED OUT AND RETURNED FOR NORMAL LANDING. E/E BAY DOOR WAS NOT LATCHED PROPERLY & COCKPIT INDICATOR LIGHTS WERE UNSERVICEABLE. VERBAL FROM F/E, DOOR SECURED / LATCHED PROPERLY, LIGHT BULBS REPLACED, WARNING SYSTEM TEST NORMAL