What was found
BLEED PRSOV R, RT ENGINE BLEED PRESSURE REGULATING SHUT OFF VALVE (PRSOV) FAILED. OPEN OR CLOSED OR RT AIR SUPPLY AND CABIN PRESSURE CONTROLLER FAILURE. STATUS MSG-3610380 LATCHED DC MODE MSG-3610380 LATCHED DC MODE. RENDERED RT PRSOV INOP IAW MEL 36040. LOTS OF PARTS REPLACED, SUGGEST CHECK SENSE LINES OR POSSIBLE BAD IP SENSOR IAW FIM. DURING PNEUMATIC HEALTH CHECK, THE FAN AIR CONTROLLER WAS STUCK OPEN ALLOWING AIR TO PAST THROUGH REGARDLESS OF POWER ON OR OFF. REPLACED FAN AIR CONTROLLER ENG RUN SYSTEM CHECKS GOOD.