Its a D-16 hybrid chassis. Very good sets.
Tube compliment 6BL8, 6LR6, 6CE3, 6LU8 & 6MD8.
If the horz hold wont bring in the pic. the first thing I would do
is change the 6BL8 tube with a known new one.
If that dont do it there is a horz freq coil that can bring it in range
but it takes a special tool & it can break easily on an old set.
If you do get it back the horz hold should be at the CENTER of its
range. If it goes out again there is something drifting & its
going to get deep..............
Also post what the shop did to it. Keep in mind even if that tech
started in 1980 he worked on few if any of these & I am
surprised you found anyone to touch it. The only person I know
that has a real shop & does it for a living that would touch it
would basicly say:
I will get a color picture and sound back.
I will not guarantee how good it is.
You will see it running in the shop when you get it.
Once its in your cars you are on your own, NO GUARANTEES !
73 Zeno