Hi - I have a problem with my ME-RC remote not communicating with my Magnum MS2812 inverter charger and need some suggestions on diagnostics. The error is "No Inverter Comm". I've tried a replacement cable, a soft reset, a hard reset. to no avail. Was thinking to buy a new controller and see f that is the problem as a next step, but a pretty expensive way to mark this off the checklist (especially with the 20% rip-off restocking fees). The Marina repair tech can't get to it for a while- and he will probably call in an expert later, but have to work the process Suggestions ? (AGM batteries only a few years old). Thanks