Burned magsafe dc in board ports: Replace, even if working?
Specifics will depend on your model, but in general it is quite difficult process for inexperienced person.

It consist of 20+ steps and without experience a lot can go wrong.

So the choice is yours, leave it as as and hope for the best or do it.

Here is an example of the process involved.

https://www.ifixit.com/Guide/MacBook+Unibody+Model+A1342+MagSafe+Board+Replacement/1676