sTEm–at-Work Puzzle #35: Gasket response to an applied test pressure pattern

A technician for Sun Hydraulics is performing the quality check on a hydraulic driven actuator before it is to shipped to the customer. To test the actuator's gasket, the Tech applies a pressure step pattern,  (as shown in the image) to the actuator and knows that the gasket should not leak when this pressure pattern is applied.  Because of an understanding of hydraulics, the Tech also knows the gasket's expected response to this test pressure pattern.

The Tech measures and records the pressure on the gasket. The pressure response is shown below and the technician absolutely knows if the actuator should be shipped, or not!  The actuator should be shipped to the customer. Yes, or NO.

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