The 41260 Troubleshooting Guide isn't much help (link below). However, "Service required" means something beyond what the owner might be expected to do, i.e. requires opening the case to do something inside. I doubt if there is any simple "reset button" inside, but a tech might be able to replace a component. You could send it back to Southwire (Surgeguard), but my guess is that they will just say to replace it anyway. The most likely explanation is that the surge guard self-sacrificed to prevent a damaging surge from reaching your coach systems.
The 41260 is a combo surge protect and ATS. My choice would be to install a separate ATS and add a hardwired surge/power protection unit. That way you don't have to buy a new ATS every time the surge unit sacrifices itself to protect you.