Pressure testing trs21

The fitting on our trs came loose. Can you put this pump under pressure to test for leaks?
How would you suggest testing for leaks on this pump.
Thanks

I put a pressure gauge on the outlet hose and turn the pump on till it reaches about 150 psi. Then I shut it off and shut the nearest upstream inlet valve.

Let sit for 30, see if pressure in the gauge changes

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I had some questions im hoping someone can answer.
I got a trs21 with the 3/8 bore. I was taking the hose off one day and the entire fitting came loose.
So now im pressure testing the pump. When i asked XD they said 50psi is what they test at.
Question 1: how long do i leave it under pressure?
Question 2: i put pressure from both sides of the pump at the same time correct?

I think i have gotten the fittings resealed up and have applied 50psi from both sides. But when left for an extended period of time the pressure seems to drop. At the 30 min mark the pressure is the same (50psi) This pump only has 40-50 hours of use at this point.

Any help would be appreciated!