My GamePad isn't charging anymore. Could I get some help?

So, I was sitting down, playing some Xenoblade Chronicles X (still a great game by the way, even today), and the GamePad’s battery dies—it only lasts like 25-30 minutes at most, used to be a lot longer. I go to plug it in, nothing interesting there. But, I noticed that the orange light wasn’t on. I’m suspecting it’s the charger that came out of the box kicking the bucket, with, of course, the usual wear-and-tear. But at the same time, I’m thinking it might be the charging port on the controller itself. Could I get a ink and some help on how to replace the charging port? If you’ve gotten this far, thank you for reading this.