Inverter issue

[David and Teresa]

When we were almost home from a short trip last weekend, I noticed an issue with my #2 inverter. In the display were random letters and numbers. I couldn't access any menus; it seemed frozen. I checked the display in the basement, same thing. I called my local service guy who suggested taking the batteries off line and see if that wakes it up. So I tried that with no change, except now the amp meters (for the whole system, AC and DC) on my coach display panel are not working.

Looking closely, it seems the buttons on the inverter remote panel don't function as easily as they do on the #1 panel. Could these be stuck somehow?
Anyway, I've looked through the forum and my manuals and can find nothing similar to this. Any ideas?