I see it's the same PLL as your T7500.
FWIW the problem I ran into spoofing the VRM was the resistor that's supposed to be measured at pin 4 of the VRM controller was in a parallel circuit with some other components and I was getting M Ohm readings that didn't make sense for the mod I wanted. I've never done the VRM mod before so I'm going to try it on a Dimension E520 where it seems more straight forward. There I got consistent reading in the .925 Ohm range that I could work with. Both VRM chips had the same number but one suffix letter added on the T7400. I'm a retired truck mechanic so electronics is strictly learn as you go for me.