But........
As explained above, the failure of the resistor pack, or more correctly the thermal fuse in it, is rarely spontaneous. It will fail again quite quickly. Its a result of low airflow.
Thats due to a slow blower because the bearings are stiff. That's due to water coming through a badly sealed scuttle cover. A lasting solution is to fix all that.
Its described above and you've already demonstrated your ability to do the necessary work.

Martin.