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Progress! After replacing the 1V2 DC-DC module outright (looked like I damaged a pad when I desoldered it) and swapping the ferrite on the GTX_1V0 output with a shunt, both rails come up.

Ripple is borderline for the 10 mV p-p tolerance for the GTX, but (barely) within spec.

So now in theory I should be able to bring up the 1000baseT PHY, and the only thing stopping me from bringing up the GTXes is now the GTX_1V8 rail.

Then I can look at 3V0_N later.