Unfortunately your too far from me. That's exactly how I make money sometimes if I know what needs to be done. I'll work on a car for way less than a shop cause I'm not a "mechanic" heck I'm not even a plumber, or an electrician, carpenter, construction worker. I'm not lots of things I just like learning new things.
Unfortunately, it is not possible to get your serviced for free. However, you can talk to mechanics schools around you but be assured if they will need any replacement , you will have to pay for it if they agree to do the servicing for free.