I have a 7.5 QD in my 2006. I am not aware of any wide spread failure of these units due to the inverter. Things break without being the result of design deficiencies.
Did you buy this coach new or used? Why do I ask?
446 hours on a 10 year old coach seems a little on the lite side to me. Is it getting regular exercise? The manual calls for 2 hours each month at 1/2 load. Give or take a few months that is close to 480 hours it isn't used for anything else. I don't know if that has anything to do with your situation but it is something to look at. (Page 11 attached file)
If you have to pull the generator consider a 1000 hour service. It ain't cheap but it is cheaper then doing it later and there are components that should be serviced/replaced at 1000 hours (or 2-5 years) depending on the components listed on the table. The 1000 hour service does a lot of parts replacement almost to the point of everything (hoses, belts...) but the motor itself. At least consider the 500 hour service. (Page 12 attached file)
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Don, Sandee & GSD Zeus. Guardian GSDs Gunny (7/11/15) & Thor (5/5/15)
2006 2015 DSDP 4320 4369, FL Chassis, 2013 CR-V 2020 Jeep Overland, Blue Ox Avail, SMI AF1.
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