Hi there,
To be honest with you it really sounds like a husbandry issue. Of course at this point it's manifested itself into a physical symptom, but MBD does take awhile to develop usually.
How you originally had your setup wouldn't have been providing proper UV exposure, which means calcium wouldn't have been getting absorbed properly. Calcium levels in the blood can be within normal range, and still not be doing anything really. Especially if the body was leaching calcium from the bones. The best way to check would have been an Xray to look at bone density. I doubt the pathology results will show a serious infection like that, but it's always a possibility I suppose.
However, I have a saying I like to use. When you hear hoof steps outside your window at night, don't go looking for Zebras. Usually it's not going to be some rare horrible thing like encephalitis or meningitis. It's almost always related to husbandry issues, at least when there is a history of husbandry not being up to par.
You really can't rely on those dial thermometers though. Do you have a digital with probe end or an IR thermometer? Temperature is probably one of the most important things to their health, and those dial thermometers have been proven to be extremely inaccurate.
I really do hope the best for your dragon. If it is just MBD, usually the symptoms don't get reversed, but they can be stopped from progressing.
But please do post the blood results when you get them.
Rooting for you two.
-Brandon