I have just received information on a new course for Hydraulic Troubleshooting from a person I have taken courses from before. I am now retired or else I would be jumping on it.
If any of you think you have good to above average skills and background knowledge in hydraulics, you should investigate this.
Talk to your employers. They may help you out with something like this. It may also be deductible from your taxes. Hydraulic skills are a great thing to have. So few mechanics have enough.