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When the aircraft arrived from London earlier that morning, the previous flight crew had reported a frozen door seal and abnormal noises coming from the right aft service door. They requested a full inspection of the door. The inspection was carried out by a ground engineer who then performed a pressurization leak check. In order to carry out this check without requiring the aircraft's engines, the pressurization system was set to "manual". However, the engineer failed to reset it to "auto" on completion of the test. After the aircraft was returned into service, the flight crew overlooked the pressurisation system state on three separate occasions: during the pre-flight procedure, the after-start check, and the after take-off check. During these checks, no one in the flight crew noticed the incorrect setting. The aircraft took off at 9:07 with the pressurization system still set to "manual", and the aft outflow valve partially open. As the aircraft climbed, the pressure inside the cabin gradually decreased. A