Surety is a DIY service provider, we do not offer on site maintenance. There are installation companies that may be able to help.
The wiring for panel power is often routed through the wall, but the 2GIG panel uses a low voltage plug-in 14VDC transformer. The transformer looks like the image below:
It is often run into a basement or utility room and plugged in there. Basements are the most common location for the transformer.
It may be plugged into an outlet near the main electrical panel, but they are sometimes just run to the nearest convenient outlet from where the 2GIG Panel is found, depending on the original installer.