Being from Colorado, there is a shop in Boulder called John’s 4x4, I highly recommend them after needing to use them (2) times.
They are very knowledgeable, and have been established for several years. They are very good about telling you, and showing you any problems they come across while servicing your vehicle, along with getting prior approval before touching anything.
One other shop to know about, Colorado Gear and Axel. Al has been there 20 plus years, honest and believes repeat customers and word of mouth are the best way to advertise. Trust me, he is not the cheapest, nor the most expensive, but definitely the most honest. He will help you anyway he can.
I drive north 2-3 hours to use these two shops when needed. I have “Trust Issues”..........lol!