What was found
DURING THE CLIMB FROM YEG, THE PRESSURIZATION FAILED. THE CHECKLIST WAS FOLLOWED AND PRESSURIZATION WAS FOUND TO BE CONTROLLABLE IN MANUAL MODE. MAINTENANCE INSPECTED THE AIRCRAFT AND DEFERRED THE AUTO PORTION OF THE PRESSURIZATION SYSTEM. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE. SDR TO REMAIN OPEN PENDING CLEARANCE OF THE MEL. *S/D* MAINTENANCE REPLACED THE PRESSURE CONTROLLER. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.