From what I have heard yes. Give him a call
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His original website is down.
I ran a search and the pictures here look right.
http://www.racingtransponderfix.com/
I would call and ask if this is John Mueller.
I messaged him about replacing the battery and he responded same day. I would think he still performs the services.
I did a little searching and it looks like he just updated his website and business name.
Even found a review online with his old website listed. Clicked the link and it forwarded to the new website.
John is a good guy!!! He is still doing the repairs. Thanks guys!