FireLite MS5012 Error?

Hello.

I recently obtained a FireLite 5012 fire alarm panel/communicator. Upon startup, it constantly beeps and displays this character (see image).

I’ve tried power cycling the panel to no avail. I inspected the board and saw no signs of a blown or damaged part. The panel briefly behaves normally for a couple of seconds before it starts the beeping and flashing the character again endlessly. I can’t find any information on the code shown in the LCD, so I wonder if there’s some CPU fault or something. Any ideas would be appreciated. Note, the AC power light does work, it just shuts off whenever that character is displayed.

Thank you.

Also, looks like that panel has seen a good amount of use.