What was found
SUPPLEMENTAL AIRCRAFT WILL NOT PRESSURIZE IN AUTO OR MANUAL. C/A-AUTO AND MANUAL PRESSURIZATION DEFERRED PER MEL 21-19 AUTH#050084DM-C MEL PROCEDURES 21-19 C/W. REMOVED AND REPLACED ELECTROPNEUMATIC OUTFLOW VALVE IAW AMM 21-31-03. AUTO TEST FAILED BUT AFTER VERIFYING THAT ALL LINES WERE TIGHT ON BOTH OUT FLOW VALVES AND RESETTING POWER PERFORMED FUNCTIONAL TEST OF AUTO PRESSURIZATION IAW AMM 21-31-00-700-802-A, OPC GOOD. PERFORMED PRESSURIZEATION ON MANUAL MODE IAW AMM 21-31-00, OPS CHECK GOOD, (M) COMPLY WITH 21-19 SECTION 4, REMOVED LOCK OUT TOOL. AFTER REACTIVATING THE PNEUMATIC OUTFLOW VALVE AND CHANGING ELCTROPNEUMATIC OUTFLOW VALVE IAW AMM 21-31-03, THE PRESSURIZATION SYSTEM FUNCTIONAL CHECK GOOD IAW AMM 21-31-00-700-802-A AND MANUAL PRESSURIZATION OPC GOOD IAW AMM 21-31-00-700-801-A. THIS RESTORES MEL 21-19.