No pricing, no DIY, please read Site Rules
If you can't read and follow those rules.
You probably would have trouble reading and following repair instructions.
No one from this side can even tell if your system is low with the info you gave.
But, if you want, I can give you the list of tools and meters you need. And then you can go spend a couple thousand dollars, and see if its low on charge.
Just don't see how that would save you any money.