NV Ram Error.
If the NVRam Battery is removed, the game will have this error when it is powers up. Perform a Ram Clear on the game.
Uninterruptible Power Supply Requirement
AGS Cabinets require a UPS connected to the logic box as that is how the machine was configured. The Software looks for the USP and adds to the logs when it does not see it. This may fill the logs and SSD, resulting in an NV Ram Error (1001-1005, or 23.12).
In secure boot jurisdictions it is recommended to connect the UPS cable USB to the blue USB3 ports inside the logic box on the motherboard to avoid 1143 UPS errors.
The following cabinets require a UPS be connected regardless of software version:
ST42P - PORTRAIT
ST23H - SLANT
ST23HR - RISE
ICON
OU27 - UPRIGHT
OU49C - CURVE
BIG RED
BIG RED 2