When in the process of elimination you have determined that the fault lies between the breaker and the fixture, shut the breaker off, open the pool box and cut the power cord, stripping and separating the conductors leaving them in free space.
Turn the breaker back on.
Another question; the liquid-tite has a wrapped ground conductor.
It this ground conductor properly bonded to the ground terminals, at both ends?
Cutting the cable is not going to happen.
the liquid-tite is bonded to the cabinet only because it is physically connected. I used a seperate ground wire to bond the mounting ring, the junction box and conduit, the cabinet and ground.