Vicki, your Dend looks fine. Although dark spotting is not what we want to see, it's not at all uncommon, especially on Dends in hot weather that don't have a lot of air movement. Humidity brings on fungal issues and should always be looked after during the summer and treated for prevention, let alone when it appears.
Dends should only be repotted during their growing season, not when resting. When they begin to grow new psbulbs is when new roots will follow. This is when you want to re-pot your Dend. These can get top heavy and you want the roots to begin to adjust themselves to the medium and anchor themselves for stability. With this said though, you still have a viable looking plant that will still grow....come springtime, when the weather starts warming up. Spring is when Dends come out of their semi-hibernating states and begin taking off. Pot it back up in the medium you're using and keep it very dry for the next few weeks. Don't water!!!!! Give it less light than usual and slowly introduce more light as you begin seeing new growth and then, start watering regularly.
This Dend. looks to be just fine.
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