Welcome to Orchidboard! Sorry that no one has tried to help you with your questions yet.
Repotting was a good idea, but applying hdrogen peroxide is not. It's quite agressive and can damage all the fine root hairs and possibly kill the growing tips. That may be what you are seeing (dead root which is molding), though you shouldn't be seeing moldy bark. My inclination would be to not mess with the plants any further than that. Water when they need it, and keep an eye on the mold issue.
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Camille
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