Mold remediation advice please!

[BJ Harrington]

Needing some advice on a mold issue. My tenant called and told me there was an issue with the floor in the master bedroom feeling like it was weak. I had a contractor go out and take a look in the crawl space and he found that some of the beams needed replaced but also found a lot of what looks to be white mold. He said there was some moisture under the house that probably caused it. I have been reading on what to do next and have found that a lot of people say be careful of bringing a restoration company out because sometimes they tend to recommend work way over what is actually needed since it is likely they would get the business. Should I find an independent testing agency to give me a report on treatment? I just dont want to get a crazy recommendation and be out thousands when it could have been solved for much less. Any advice would be greatly appreciated.