Lionel ZW 6C Transformer

You might have to find a board level repair tech willing to take on the work. Like many things, key parts like the mainboard are NLA https://www.lionelsupport.com/...r-Supply-Set-6-32930

https://ogrforum.com/topic/zwc-repair

Again, per that topic and let's be honest, true of many electronic transformers and devices- there is a chance it is repairable typically the output control devices provided the core logic and microcontroller is not damaged. Typically TRIACs or FETs. That said, not everyone has the skills or is willing to work at that level, and literally no guarantee that putting money and time into it brings it back.

You might go to shows, auctions, and find a controller as the ZW-C was known to be semi problematic anyway (between the brackets breaking, known Legacy firmware issue) and might find just a controller without the bricks because someone sold the bricks. I know in the last 2 years, I sold 2 of them  but have none at the moment.