Sunnyboy 6000 not working

[Naptown]

I could not find that fault code in the manual

[JDenver]

I discovered that my Sunnyboy Inverter is not working. Even though there is a green light on the front, indicating that it is operating normally. This has been going on for more than 9months. And I was told by an electrical engineer (not that I needed an electrical engineer) that it started to fail about 2 yrs ago! I called SMA, they said to replace it with their newer model. Cost about $2000+

The Error is -- Disturbance - XFMR ---so other than this... and my utility bill being higher! there was no other indication.

I asked about the 5yr warranty and the unit failing within the 5 yr period but they refused to honor their warranty. So I don't know what to do.

I don't have a spare $2000.

My question to the Forum is.... is there an inverter (a 6000 watt) inverter that will replace the Sunnyboy 6000 that cost under ~$500???
Or some other recommendation to get this back on-line??

Thanks! JDenver