If you start looking for a new board, make sure you get the one that has the relays on it and not the one with transistors. The relays handle more current and are more reliable. I had an old board that would only run in one direction because one of the transistors failed. I replaced it with a board with relays. I have had several derailments that caused shorts and never once did that cause a Williams reverse unit to fail. They are far simpler and more robust than some of the other brands and will handle shorts without issue in every case I have had. This issue may be the reason they were being sold. I have been buying stuff on eBay for almost 20 years and I have had plenty of undisclosed issues to deal with. If you got a good deal, now you know why. At least it is an easy and cheap fix.
