ISO Flyback for 17” Predicta

[UberVacTuber]

Hi all, as the subject indicates, I’m in need of a flyback (new or used) for a 17” Predicta (10L4X chassis). The one in the set has an open set of windings, causing the resistor in the yoke socket to go up in smoke.

Any thoughts on what could be causing this? I really don’t want to ruin a replacement fly if there’s something wrong in the set. I’ve gone through and replaced the caps and out of spec resistors. The set makes a raster and gets audio and video. I’ve also replaced the damper and horizontal output tubes. I’m not sure where to look next...