What was found
C/W M/M STATIC TEST, LIGHT DQUENCE SHOWS THAT CONTROLLER IS OUT OF CALIBRATION. FURTHER TROUBLESHOOTING FOUND SEQUENCE IS CORRECT. SUSPECT MOISTURE IN PLUMBING LEADING TO OUTFLOW VALVE FREEZING. REMOVED MAIN BATT. FOR ACCESS. REMOVED ACCESS PNL'S. AFT. CABIN. REMOVED PRIM. OUTFLOW VALVE. INSTALLED PRIMARY OUTFLOW VALVE. IAW 560 MM 21-32-00. PRESSURIZED ACFT. PRIMARY OUTFLOW VLV LEAK CHK GOOD. C/W FUNCTIONAL CHK OF PRIMARY OUTFLOW VALVE MAX DELTA P. CHK IAW CE 560 MM 21-32-00. CHK GOOD - VALVE OPENS AT 9.1 PSI. NEED TO C/W RUN CHKS. C/W RUN CHECKS ALL CHECKS GOOD.