What was found
ON DESCENT, CABIN BEGAN TO CLIMB. WENT TO MAX RATE ON AUTO CONTROLLER AND MAX FLOW ON PACKS, WOULD NOT STOP CLIMB, CABIN COULD NOT BE CONTROLLED MANUALLY EITHER. ANY ATTEMPT TO MANUALLY CONTROL PRESSURE CAUSED CABIN TO CLIMB HIGHER, MANUAL LEVER COULD NOT BE MOVED PAST 3/4 CLOSED. REMOVED AND REPLACED OUTFLOW VALVE ACT IAW M/M 21-33-01. REMOVED AND REPLACED PRESS MANUAL CONTROL LEVER LIMIT SWITCH IAW EMERY M/M 21-32-06. BOTH AUTO AND MANUAL PRESSURIZATION SYSTEM OPS GOOD IAW EMERY 21-30-01.