Looks like all left is the damper. Also there is a VDR in
the HV reg that causes a minor width problem. On newer
sets HV control gets a bad spot but also only causes minor
problems most would ignore. Power supply also poss.
but you should get hum bars in that case.
BTW the OEM Zenith VDR's are going bad on the shelf.
There is a sub for it, was talked about a few months ago.
Since you will be pulling it probably best to replace it and
the 2 vert integrators, all high failure stuff.
73 Zeno