did you disconnect everything frmo the secondary side and fire up the primary side and see if the resistor still get hot.

if not, you have a fault on one of the secondaries, reconnect them one by one.

if it still gets hot, you have a fault on the pri side or a bad xformer perhaps in the form of a shorted winding. Use yopur 2v drive on the pri to try to isolate a shorted winding,,,how??? I'm not sure. See if there is any winding that when you intentionsally short it, nothing much happens.