Definitely a good idea to unpot, check things out and give it new medium. If this were my plant, it would go into a much smaller pot, not larger. They love tight quarters. I had to change the medium on my Dend. recently and transferred it to a larger pot which I regretted. I ended up repotting it into the same size it originally was in. It definitely suffered a setback from the repotting and probably because it wasn't actively growing at the time which is when you'll want to make any changes to yours.
Remember, tight fitting!
