What was found
PRESSURIZATION PANEL "AUTO FAIL" LIGHT AND "ALTN" LIGHT IS ILLUMINATED. GROUNDED - YES. AFTER MOVING MODE SWITCH TO "MANUAL" THEN BACK TO "AUTO", "ALTN" AND "AUTO FAIL" LIGHTS EXTINGUISHED. BUT FOUND LCD DISPLAYS STAYED FULL BRIGHT WITH "LIGHTS" SWITCH IN BRIGHT OR DIM POSITION, AND PANEL LIGHTS INCREASED OR DECREASED. REMOVED AND REPLACED CABIN PRESSURE CONTROL MODULE PER B737-800 AMM 21-31-02. TESTS GOOD PER PRESSURIZATION SYS GROUND TEST AMM 21-31-00 AND PRESSURIZATION MANUAL MODE TEST AMM 21-31-00. DCPC BITE REF B737-800 FIM 21-31 TASK 801 SHOWS NO FAULTS.