New House Alarm - Am I locked out?

[jasonextras@xxxxxxxxx]

Hello all.  I recently purchased a 7 year old home that has a built-in
alarm system.  The previous owner chose to purchase the unit as part
of the then-new home's price rather than lease, but when he had the
monitoring turned off prior to sale it looks like they locked the
board.  They used a First Alert FA147c panel and a fixed word keypad.
It permanently displays "dl" on the display, which according to the
manual means the system is disabled.  No notices for zone trips are
provided and the motion sensors are shut down.  I cycled the power and
used both * and # methods to try to retrieve the installer code, but
#20 makes the system display "EE" on the keypad.

It appears I'm locked out and the system is permanently disabled.
Does anyone have any experience with this board to know if this is the
case for sure?  If it is locked, what are my options?  Can I swap
boards with a Vista 10SE and keep my sensors as they are, or do I have
to ditch everything and start over?  A drop-in FA147c replacement has
proven impossible to locate, and even then I'd have to procure a Alpha
keypad to program it.  I'd just like to be able to use this alarm
locally without a monitoring service.

Thanks for your help.