I pulled the Chassis tonight. It was much less of a chore than I had anticipated.
Tomorrow I'm going to replace the rest of the electrolytic caps I haven't already replaced, install the NOS 25GP22 rebuild, and do the convergence and setup.
If anyone asks, that's a last gasp 1978 Portacolor peeking in the right side of the frame. It has the stripe Phosphor tube and click-stop UHF tuner. I've been using it temporarily because I've been too lazy to dig into the Zenith for the past few days.