It seems that the latest SPF3500 ES with 067/068 firmwares are suffering the same issues with fan spin like the 5000 ES models. At least with firmware 067.F2 / 068.F2 this seems to happen. Is there also a 3500 ES fix for the constant fan issue spin avialable? only firmware in the firmwarepost for the 3500 ES seems to be for the older 040/041 versions