Hi
Living in the salt belt, I have changed/repair many. In my neck of the woods servicing hinges are a part of our "oil service" every 3000 miles.
There are some options to replacing them, depending on the price, hinge pin bushing kits are a good way to go, and because of the brass bushings they are less likely to jamb. An experienced tech can do them in place, but its much easier to remove them (one at a time) and work on the bench.
Good luck with it
Later