What was found
CLIMBING ENROUTE, FAULT ANNUNCIATOR ON PRESSURIZATION CONTROLLER ILLUMINATED. CYCLED DUMP, MANUAL, AND AUTO SELECTOR TO MANUAL AND BACK TO AUTO AFTER TWO SECONDS AS DIRECTED BY EMERGENCY CHECKLIST. FAULT ANNUNCIATOR ILLUMINATED ONCE AGAIN. CPC PANEL FAULT LIGHT NOT ILLUMINATED ON ARRIVAL. INTERROGATED CDS, FOUND NO FAULTS. CHECKED PIN 13 OF CABIN PRESSURE CONTROLLER CONNECTOR 2131-P1 FOR PROPER CONFIGURATION. CONNECTOR IS PROPERLY CONFIGURED. REMOVED & REPLACED AFT OUTFLOW VALVE IAW AMM 21-31-16-000-801 AND 21-31-16-400-801. FUNCTIONAL TEST OF PRESSURIZATION CONTROL IS GOOD. FAULT LIGHT REMAINED EXTINGUISHED. RETURNED TO SERVICE.