What was found
CREW REPORTS RT ENGINE BLEED IS STUCK IN THE CLOSED POSITION & WILL NOT OPEN. DEACTIVATED RT ENG PRSOV IN CLOSED POSITION PER MEL. CHECKED MAT, NO MAINT MESSAGE, NO PREVIOUS HISTORY. INSPECTED PRSOV, CONTROLLER, SENSE LINES, WIRING AND CONNECTORS, NO ABNORMALITIES OBSERVED. REACTIVATED VALVE AND ACCOMPLISHED ENGINE AIR SUPPLY OPERATIONAL TEST PER AMM. NORMAL PRESSURE AND INDICATIONS ON AIR SUPPLY MAINT PAGE. CYCLED PRSOV SEVERAL TIMES, NORMAL OPERATION. NFF.