There are places that repair them. If you are close to Atlanta, I had mine repaired and very reasonable, but shipping cost is so high it is prohibitive to ship for repair vs new cost of app. $900. I suggest downloading the xantrex troubleshooting guide and following it in detail to determine if it is your inverter or other issues.
There is a small fuse (F2) inside the inverter than can go bad.. I think it is a 3amp. you can test it externally, but have to remove the inverter and cover to replace it if needed.
I suggest pulling off the front plate and testing for voltage there when either the generator is running or plugged into shore power. .. and go from there. Also find use a light or somthing to test other 110v plugs to see if you have power.
The inverter also has an internal transfer switch which can prevent it allowing shore power from reaching inside the coach. At least the way mine is wired, it can. Took me 2 weeks to completely troubleshoot my inverter.
Hugh 'n Deb - USAF Retired B-52 Pilot
2004 Safari Zanzibar 40', F-150, BlueOx TowBar, SMI AF1