Hi Saltiest,
Have you tried running ProAIS2 ? Linky to software download below;
www.raymarine.com/service-and-support/software-updates/Its a great little diagnosis app, runs on a Win PC or laptop. You typically connect via USB, just check the interface on your transponder.
You normally unplug the AIS from power, as the USB port will provide the power needed while you run the app.
Here's a link to a diagnosis with ProAis.
You didn't really need to read a manual or watch a how to video, its pretty self explanatory once you open it.
Might give you some guidance?
SB
Edit: And the best thing is you don't need to be a rocket scientist to use it!