What was found
(CAN) DURING CLIMB, THE CABIN PRESSURE STARTING INCREASING AND THE CREW COULD NOT ADJUST. EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO BASE. MAINTENANCE FOUND SMALL LEAKS ABOVE SERVICE DOOR, FILLET SEALANT ADDED. AFT CARGO DOOR WAS RE-ADJUSTED, ITS SEAL REPLACED. PRESSURIZATION CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. SEAL: P/N CC670-38730-3.VENDOR: INDUSTRIAL VENTILATION (CAGE: 98269) NOT LISTED IN THE DROP DOWN MENU.