Does anyone know who may be able to service these? I had two MTH engines converted a few years ago and am now having problems with both.
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What kind of problems? Maybe we can help you get them running. I fix my own, and I know a bit about them. 
One of mine runs very slowly and will not respond to any TMCC commands. Reprogramming doesn't help either. I replaced the R2LC board and that had no effect. Any suggestions?
The first thing I usually try is running in conventional mode and seeing if that works properly. That will give us more information. Did you carefully check all the wiring for any loose or broken wires? Is the antenna properly connected? Can you control the headlight or sound with the remote?
If you can't control stuff like the headlight or sound from the remote, I'd be looking at power supply components, since they're basically run right from the R2LC board through traces on the SAW board.
