What was found
ON FLIGHT 4526 THE CREW REPORTED THAT ON CLIMBOUT THE AUTO PRESSURIZATION CONTROLLER FAILED. MANUAL CONTROLLED CABIN NORMALLY. THE CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. ITEM DEFERRED PER MEL 21-16 AUTH# 041068DM-C. M PROCEDURES COMPLIED WITH. AUTO PRESSURIZATION INOP. REMOVED AND REPLACED DIGITAL CONTROLLER IAW EMB 135 AMM 21-31-01. REMOVED AND REPLACED ELECT PNEUMATIC OUTFLOW VALVE IAW 21-31-03. PERFORMED FUNCTIONAL CHECK OF PRESS CONTROL SYSTEM IN AUTO MODE. FUNCTIONAL CHECK GOOD. THIS RESTORES MEL 21-16 AUTH# 041068DM-C. THE AIRCRAFT WAS RETURNED TO SERVICE.