GE 10T1 Help Needed

Selenium rect's replaced (bad), I've replaced most of the electrolytics and all the paper tubulars but still can't get the vertical hold locked in well. Looks as though the horiz hold has an effect on the vert and the whole pix is wavy. On the plus side, I've got good detail, sound and a full raster. I know these chassis are pretty common & presume several users have 'done' one of these, so where should I look next? Don't have a scope, so what's a good alternative? Start checking all pin voltages in the vert section or is there some similar fault common to these?
Thanks for any help!

Michael