KX-T: TVS100 troubleshooting

[brucek]

What is 4 flashes of the power indicator on a TVS100 trying to tell me?

The system started to behave funny yesterday (kxtd132+tvs100) - the AA/custom service menus answers calls fine, but when an extension was dialed, and not answered, the prompt returned to the menu without ever asking "to leave a message...."

I entered the customer's mailbox, and noticed the box was full with 100 messages.  

Why didn't it give the "mailbox full" message?

I told the customer to delete some messages.
I don't know what they did, but they now claim that they cant get into the voice mail at all, and the tvs100's power led is flashing 4 times.

Any ideas (besides the hard drive crashed)?
Thanks
bruce