What was found
CREW REPORTED THAT DURING FLIGHT RECEIVED A COOLING PACK 2 VALVE CLOSED MESSAGE. COOLING PACK 1 WAS DEFERRED THE PREVIOUS DAY. AS A RESULT THE AIRCRAFT LOST PRESSURIZATION. THE CREW ALSO REPORTED, RECEIVED WING ANTI-ICE 1 AND WING ANTI-ICE 2 VALVE FAIL MESSAGES. RETURNED TO KMEM AND LANDED WITHOUT INCIDENT. MAINTENANCE LOCKED BOTH ANTI-ICE VALVES OPEN AND DEFERRED THE WING ANTI-ICE SYSTEM. PERFORMED OPERATIONAL CHECKS OF THE PRESSURIZATION SYSTEM AND OPERATIONAL CHECKS WERE GOOD. KSDF MAINTENANCE CLEARED THE DEFERRAL FOR THE WING 1 AND 2 ANTI-ICE SYSTEMS LATER THAT DAY. REPLACED RELAY K0528, OPERATIONAL CHECKS OF THE WING 1 AND 2 ANTI-ICING SYSTEMS WERE GOOD WITH NO FURTHER DEFECTS NOTED.