Charles
There really isn't an answer - if you've truly isolated both rails of the indicated track, and each rail is only wired to one of the two outputs of the PSX-AR, and the PSX-AR is indeed receiving input power from the booster, then either
one rail isn't, in fact, wired to the PSX-AR
or the other rail isn't
or the PSX-AR isn't doing it's job.
So, tell us how you tested the PSX-AR, and how you've verified that the PSX-AR has input power.  There has to be something wrong with the testing, or the test interpretation.
Blair