Help! Need ONAN Generator Service S. Houston

[Outback]

I have a circa 1975 Onan 30kW generator with automatic switch on my house. Recently, it stopped switching so even though it starts up and runs, it isn't powering my house. I also need to replace my exercise timer.

Any green screeners familiar with this vintage unit? I'm happy to pay and would be even happier if it was a localish green screener!

Thanks! PM me.

Jayson