Us oldsters that come from a “fix it ourselves” age do have a bit of a leg up. I’ve replaced the motor capacitor on my HVAC before. But anything that has to do with the pressurized system is outside my area of being able to do squat.
Spokeshave who is an amateur professional fixer.
......from another “oldster” (mid-70s now....) I know what you mean...but this A/C system goes back to the early 1990s so it is probably ready do be junked....!! but I agree; over my lifetime I have learned how to so many things around the house so as to not having to “give it out..” as my late father-in-law used to say.....