Looking for Generator repair!!

Description

I am looking for someone who is experienced with Onan generators. I have been having the same issue with my genset since last fall. It will run fine for hours but underway load is shuts down and throws a code 58. Carb, fuel pump, temp sensor, spark plugs, spark arrestor, filters and oil have all been replaced with no luck. I have had it in for repair multiple times with no luck.