Advice on dealing with a focus element issue in a 21AXP22

[Electronic M]

This is as far as I got.
IMG_20190421_205249100 by Tom Carlson, on Flickr

The can lytic cluster is still original as are all the papers in the audio section, the low voltage lytics in the HV cage, and there may be a paper composition domino hiding somewhere.

Color lever varies horizontally across the screen, color lock ain't terribly stable from power up to power up, and dynamic convergence won't exist till I install the chassis...I've got it connected to the cabinet on cable extenders, but didn't have one for convergence so I left the one in the set unplugged and grabbed a second one (from my Seville) to use as a dummy load for the chassis.