one healthy process is strong evidence against shared power-source failure
spool-gun and other accessory branches must be bounded before internal repair
flashing-panel history matters, but it should not override a clean process split
Failing Moves
ignoring polarity connector proof
blaming the base machine for a spool-gun-only complaint
opening the machine before base MIG is proven
Passing Answer Summary
A correct answer starts by proving the MIG-only path externally, strips the machine to a plain base setup, and only moves to internal maps if the stripped-down machine still fails.