What was found
FLIGHT 4155 OBSERVED A CABIN DIFFERENTIAL POUNDS PER SQUARE INCH OF .23 AT FLIGHT LEVEL 110 AND THE AIRCRAFT WOULD NOT PRESSURIZE. FLIGHT 4155 DIVERTED INTO PIT WHERE IT WAS INSPECTED AND FERRIED TO CAK DUE TO NO PARTS BEING IN PIT. MAINTENANCE IN CAK INSPECTED AND FOUND THE CARGO DOOR SEAL NEEDED ADJUSTMENT. MAINTENANCE ADJUSTED THE SEAL IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 52-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.