Here's Dean's quote from the pm: ""Your condition results in some limitations in your ability to perform work related activities. While you are not capable of performing work you have done in the past, you are able to perform work that is less demanding. . . substantial work can even be part-time..."

Dean, I'm going to try and still respect the privacy of your pm's, but something that I think that is important to note is that SS may not have factored your PN or SFN at all when deciding that you could no longer teach, the decision could be based solely on your mental impairments. (This is based on just the portion you quoted, of course.)