Spa draws down in spa mode

I'm guessing that one of the valves is not turning all the way, an alignment issue, that's causing this ?

ive attached some images of the plumbing

I'm considering just ordering new valves and actuators. Ive "repaired" one of the limit switches in one of the valves already

One question is do I need to replace the valve housing or can I just buy the guts and the actuator and leave the body of the valve ?

Another is that it looks like a check valve on the return side of the spa ... Is...

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