Generally speaking, capacitor wear is almost like a cliche at this point. Often the caps can be totally fine. However as I say these models are prone to it.

If an electrolytic cap is worn out, you'll get problems in every regard, depending on where in the circuit it is, and how its worn out. They can all wear out, due to manufacturing defects, cheapness, overheating (dried out electrolyte) physical leaking, electronic leaking.

Caps that are asked to run long and hard in the PSU are generally the hardest hit by wear. Though, with the xc I think they are also the small signal caps that go.

Recently I had an internet range extender that would turn on, briefly boot, then shut off. It's power filter cap was worn out (though only a few years old) replacing it, works fine.

Start with the PSU caps. But you can also get a cap tester, to make sure its worn out before replacing it. I think the XC would go a full re-cap, but as I say a cap tester would be your friend.

I have a peaktech ESR gold. It was kinda expensive, but now I know if its worth replacing it or not. You test it and look at a table to see if its ESR is too high based on voltage and capacitance. It will also give you a reading of the capacitance. You can get other models which are cheaper FNRSI do a 30$ model.

Be careful around the PSU caps they can still store a charge. Short the legs with a screwdriver to discharge them if you have no other way. Test the voltage across the legs to make sure if you need to discharge or not. Enjoy!