Do you happen to know someone who does those mods to the newer block logos?
No, sorry man I sure don't. Any good tech can do it. There is a lot if info on the net on how to DIY, also.
I have one that needs the mods too but I didn't want to bother (do to time restraints), so I just bought the MXR Custom shop Phase 90 CSP-101S/SL. It has the original phase 90 circuit design and components. Sounds exactly like the original I bought back in the early 70's and sold to buy the late '80's Block 100
One of these days when I have more time I will do the mods on the Phase 100 block because it has more options with the controls, but for now, the original MXR 4 stage phasing circuit in the MXR Custom shop Phase 90 CSP-101S/SL totally nails it!