What was found
AUTO FAIL PRESSURIZATION UNCONTROLABLE ABOVE FL250TOMC REQUEST. PERFORMED FIM 21-31 TASK 801, NO FINDINGS. ALL CHECKS GOOD. STATUS INDICATIONS ARE AS EXPECTED. AUTOFAIL LIGHT IS OFF. PERFORMED 1 AND 2 PRESSURE CONTROLLERS GROUND TEST, REF AMM TASK 21-31-00-700-802, BITE TESTS CHECK GOOD. PERFORMED MASTER CAUTION TEST, REF AMM TASK 21-31-00-700-801, OPS CHECKS GOOD. PERFORMED FLT ALT AND LAND ALT DISPLAY TEST, IAW AMM 21-31-00-700-803, LAND ALT DISPLAY WINDOW - ONE DIGIT NOT DISPLAYED CLEARLY (SEE PICTURE). REPLACING CABIN PRESSURRE CONTROL MODULE RECOMMENDED. PERFORMED CABIN PRESSURIZATION LEAK TEST, IAW AMM 05-51-91-790-801. LEAK DECAY CHECK WITHIN LIMITS, ELAPSED TIME FROM 4.0PSID - 2.5PSID WAS 156 SECONDS. NOTED DUAL ALTIMETER AND DIFFERENTIAL PRESSURE INDICATOR ASSY SHOWING INACCURATE INDICATION ON THE CABIN ALTITUDE NEEDLE (TURNING COUNTERCLOCKWISE). REPLACING THE INDICATOR ASSY IS RECOMMENDED. CABIN ALTITUDE AND DIFFERENTIAL PRESSURE INDICATOR REPLACED AND OPS CKD OK. SELECTED SDR REF LP 8726909 FOR CABIN PRESSURE CONTROL PANEL WORK PERFORMED AND REPLACEMENT REF LP 8726909 FOR CABIN PRESSURE CONTROL PANEL. ALL WORK COMPLETED AND COMPLIED WITH.