After the 'org crashed yesterday I moved my plant into my shop and on a propagation mat, I've also stuck a thermometer into the patient's bottom....I mean pot of soil....
and after six hours or so it's been holding stead at about 85F. I removed the bag and have left it off with humidity ranging from 28%-35%. I am still aerating the pot. I removed one leaf whose petiole had dried up. It is also under a fluorescent grow light (two 48" bulbs). It looks like it's an incubator at the hospital! :P
I have not yet convinced myself to dig up the plant or treat it with a fungicide, though I did buy the AGRI-FOS systemic fungicide Richard had recommended.