Couple things I can recommend.

I had a 20+ year old remediation system on our home. There's kits you can purchase to perform the testing. The same kind of testing commercial companies will use.

If you're concerned about the exhaust motor/fan, there's a couple big name exhaust systems that are used by all the companies. Our old one was rated to last only between 15 and 20 years. I was surprised it lasted as long as it had, and was getting noisy, so I decided it best to replace it. I bought the newer more energy efficient replacement model and swapped it out. It's now whisper quiet. Even if you have limited electrical knowledge it's a rather easy fix. It might even be cheaper to have an electrician install it than a radon remediation company.

Also. Our home being older, when the most recent roof was changed, the vent exited below the roofline. If you want to be to code, the exhaust should be to the level of your roof and away from your home. Use PVC. For the end piece, buy something with a screen. I found multiple bird skeletons, maybe even part of a squirrel skeleton from creatures that entered the exhaust pipe and never made it out.

These are just suggestions if you're comfortable doing things yourself. I replaced the exhaust fan and pvc piping for around $400, including testing.

When in doubt, call a professional. Can't remember the name of the company, but they're either in Sykesville or Mt. Airy and came highly recommended.