What was found
AFTER REACHING CRUISE, CREW FELT A BUMP IN THE PRESSURIZATION & CABIN PRESSURE BEGAN TO RISE, DONNED OXYGEN MASKS & PERFORM ALL REQUIRED CHECKLISTS. AN EMERGENCY WAS DECLARED AND DESCENDED TO 10000 FT. CABIN ALTITUDE REACHED 15000 FT & PAX O2 MASKS DEPLOYED. ONCE STABILIZED, DIVERTED & LANDED WITHOUT INCIDENT. FOUND AIR LEAKS AROUND MAIN PAX, SERVICE DOORS AND COCKPIT SIDE WINDOWS SEALS AND REPAIRED. FOUND CONNECTING B-NUTS TO ELECTROPNEUMATIC OUTFLOW VALVE LOOSE AND TIGHTENED. FOUND LEAK BEHIND THE NR 2 STATIC PORT AND CORRECTED. DISCOVERED 1500 FT/MIN LEAK IN ELECTROPNEUMATIC OUTFLOW VALVE. THE VALVE WAS REPLACED . OPS CHECK FLIGHT AND THE PRESSURIZATION SYSTEM CHECKING NORMAL. AIRCRAFT RETURNED TO SERVICE.