Dendrobium with faded spots and splotches on leaves

[ambersartain]

Hi, I have an old dendrobium that I badly neglected during the summer, a NOID from Walmart. I let it get really dry a lot during the summer and it stayed outside in sometimes 100 degree heat, mostly 90's, still very bad for it. It got pretty beat up out there. When I brought it in for the winter I still haven't treated if very well. Bad orchid keeper.
Here are some things that really concern me about it. The worst thing is the leaves are getting these spots on them, about dime size and usually one in the center. It starts out yellow and then fades to tan and dies. The change in color is not sudden, it gradually fades back to green. I've already lost one leaf this way. I cut it off fearing it was a disease.
Also, the older and younger canes are two different colors, the older a lime green and the younger dark green. The leaves are also mottled with darker and lighter spots. I fear virus. There are also some spots I thought were scale but when I tried to scratch them off with my fingernail I had to dig through the leaf to get them off. Here are some pictures: