Can this orchid be saved?

[lucyc400]

I purchased a white Phalanopsis at Home Depot several years ago. It grew quite large with several sets of leaves with aerial roots in between the leaves. This Spring I noticed the leaves in the center of the stem turning yellow (leaves on top and bottom were fine). After examining the base of the leaves, I noticed what I think is black mold (may have been caused by my over misting the aerial roots). I tried dusting the area with cinnamon.

Does anyone know how I can save this plant? It has been producing beautiful spikes of flowers and has lots of healthy roots.