Converter Toubleshooting Question

I didn't pick my words carefully if it sounded like I was suggesting to replace the big resistors. The heat cycling can cause fatigue cracks in the joints where the resistors are soldered to the circuit board. I wouldn't attempt to diagnose a particular converter without having it in hand, just passing along that I've repaired two wfcos by reflowing these joints. It's IMO a limited time fix, because the poor design of the resistors transferring that much heat to the board will eventually cause the board itself to be the failure cause. I join others in suggesting to take the opportunity to go to a non-wfco converter. I've got 3 working wfcos sitting on the shelf. They make great battery chargers and bench supplies.