What was found
DURING CRUISE OUTFLOW VALVE BRIEFLY OPENED AND CLOSED, CREATING A RUBBLE/SHUDDER. PER T/S REMOVED AND REPLACED AUTO 1 CABIN PRESSURE CONT UNIT, IAW AMM 21-31-02. OPERATIONS CHECK GOOD. OFF PART: PN 21173888, SN 62-A0346. REMOVED AND REPLACED AUTO 2 CABIN PRESSURE CONTROLLER UNIT, IAW AMM 21-31-02. OPERATIONS CHECK GOOD. OFF PART: PN 2117388-8, SN 62-A0276. REMOVED AND REPLACED CABIN PRESSURE OUTFLOW VALVE ACTUATOR, IAW AMM 21-31-04. PERFORMED WIRE RESISTANCE CHECKS, IAW AMM 21-31-11 AND WDM 21-31-21. NO DEFECTS NOTED AT THIS TIME.