Well, I am not familiar with that brand but Ixm sure we can figure it out.
This tub has obviously had some repairs done before, and sometimes people will diy some pretty crazy stuff. Hopefully we don't find too much of that.
The black threaded fittings in the top pic are unions, and are likely for a pump, but could be used on a uv, salt cell, or other component as well. The configuration suggests pump, but unless there is alot of play on those pipes it will not connect to any pump I know of. Can you determine where those pipes go?
It looks like a check valve was added on the left. It should have an arrow on it to indicate flow direction. If pointing toward the black union it is the suction side of the pump, and if away it is the pressure side.
Threaded fittings are uncommon in spas and may have been added later, or used on a blower connection perhaps. Can you determine where that pipe goes?
A shop vac set up to blow can help in tracking pipes. Just hold the hose into the pipe and see where the air comes out. Check valves and closed slice valves will prevent air flow.
See what you can track down, and post more wide pics and we'll go from there.