The underwater lights, assuming they’re factory, are a known weak point. Almost everyone experiences failures with them. You have two options: buy another one of the same type, with the knowledge that they’re garbage and you’re going to have to keep replacing them, or replace both of them with Lumitecs and be done with it. I’d go option B, but that’s just me.
As far as the cup holder light goes, unless you’re really passionate about having light-up cup holders, I’d just unplug them. Can’t for the life of me see why I’d need that, other than the “cool factor”. If you do want to keep it, I doubt they’re serviceable; probably have to replace the whole thing. Pull it out, get a model number off it, and order a new one online.