We have the same lights and are finding that they are beginning to fail after 4 years. I have found replacement lights of the OEM variety available on eBay @ $10.00 each here:
https://www.ebay.com/itm/12V-LED-12-...8AAOSwmYxbUN6r.
Last time I looked they were not available on eBay, but I did find them somewhere for around $20 and up.
I also have tried replacing the LED board itself and so far it is working well, although we do not have a long history with them yet to know if it is worth doing. I find the lights priced at $1.85 and up depending on which ones you buy here:
https://www.ebay.com/itm/12V-Piranha...72.m2749.l2649.
Take the light apart, use double stick tape to hold the LED in place, add male/female wiring connectors for easy replacement and you are good to go.
Steve