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The diode pack is multi section and has its fingers in every part of the dynamic convergence pie...also most of those were selenium diodes which are not the most stable rectifier technology...
What I do when I repair a convergence board is change the caps and diode pack, and check resistors...if that don't fix it there can be 2 problems (the set I most recently did this on had both) 1 the convergence yoke happens to work better somewhere under .5" fore or aft of its intended resting place, or the dope before you installed the clover backwards so the green magnet is over the red gun and the red is over the green..... normally I wouldn't suspect the latter but the set that had that problem had new convergence diodes hacked in and resistors clipped out with " Ray Charles soldered this in with his feet" type craftsmanship...
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