As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OUTFLOW POSITION INDICATOR READING CLOSED WITH VALVE FULL OPEN. ACFT GROUNDED. COULD NOT DUPLICATE DISCREPANCY. LED DIGITS ON OVERHEAD PRESSURIZATION PANEL DOES NOT DIM WITH TOGGLE SWITCH IN DIM OTHER LIGHTS IN COCKPIT PROPERLY DIM. REMOVED AND REPLACED CABIN PRESSURE CONTROL MODULE IAW AMM 21-31-02.