When you call the vest company, they usually have you "reset" it first, the red button in the back if its a HillRom... although once you tell them which device error it is, they may already know that is done for.
I had something similar happen to me, I dont remember the specific device error, but instead of clinic, you need to call the company since it does have the lifetime warranty. They will overnight a new vest for you and like others said, you pack up the broken one.
They had me try to reset it first btw, and it didnt work so thats why I got a new one.
And now that the 105's out, I imagine you should get an upgrade <img src="i/expressions/face-icon-small-smile.gif" border="0">