I contacted Losmandy and they gave me the name of Michael Herman.
We texted back and forth. I asked if he minded if I shared with the CloudyNights people. His answer was yes and here is some of his email to me.
No problem at all...please do mention it in Cloudy Nights...I just don't visit there frequently. I am one of 3 fellows worldwide who repair Gemini units. The others are Brendan Smith in Australia and David Partridge in the UK.
It will be $50 to replace the diode. I will thoroughly check the rest of the operation of the unit. Shipping is about $16 using a USPS small carton that is a good tight fit to the Gemini-1, with a plastic bag for moisture protection. I don't need the cables or handset...I have all that.
But for $100 total I will do much more valuable work for your G-1. I will put in a transistor circuit I created to bypass the D1, eliminating the voltage drop and saving the CPU and SRAM. I will add zener diodes to the serial port nodes protecting them from over voltage. I will update your eprom to the latest level 4 v1.05 if it needs it. I will replace your battery if it needs it.
A full repair of a damaged unit generally runs $200. To "bulletproof" a working unit is $100. I can take PayPal or a check.
This is obviously not my main living. I only do these repairs and upgrades as a service to our fellow Losmandy gemini owners. I myself have 4 or 5 of these units and they work fine for all my needs. I can send you upgrade PDFs too about souping up your mount to about 2 arcsec RMS PE or better. Let me know if interested...(sorry if I already sent some your way!)
*I decided to withold his number and address- If you are interested in contacting him, pm me*
Edited by MockTender, 18 March 2021 - 10:22 PM.