If this started AFTER re-capping be sure all the caps
are the right value & put in the right way.
Assuming its a solid state set the vert would never
get so far out of adjustment, it would be a component
failure. Also be sure the V hold, V size & V lin controls
are OK they are cheap & easy to break.
HINT when re-capping do one or two at a time then
test for major changes. This will save a lot of grief !
73 Zeno