Sure looks like the yoke but almost too easy.
Keystoned pictures usually almost filled the screen
& this one is quite small. That makes me think
vert problem.
There are 4 lytics in the V out start with them.
Dont remember which but one causes odd problems
IIRC. Yokes were trouble but I saw few because I was a
bench tech so worked on very few consoles, just
jig work. Yokes got changed in the house.
If it were me I would take any old Zenith yoke
& mouse it in for a test. Most other 90 deg yoke.
probably would work enuf for a test also.
Also consider a ringer. Very accurate & useful.
Better yet an analist that does much more.
73 Zeno