If your happy with the shot cycles and performance. Nothing. If your concerned it’s dry and does not sound right or feel right but was good two years ago . A simple relube and check of seals is all you will need. If it was bad from start and you know it ,from shooting others that are better. Then and then is it time to think about new spring and seals as well as guides
It is a simple gun to work on that if your comfortable with screwdrivers and have common skills about tools you can do it yourself .. factory springs ,you can do with out a compressor but you do need some shoulder and dexterity.. making a spring compressor is not hard and you have it for all your future guns..
There are a few premade kits that drop in and will make it a great shooter. I just finished doing a .22 build with some minor extras that you could do yourself if confident ..