I've got a 4 yr old PE Summit insert whose left side blower fan is starting to do some intermittent low-level squealing. I can't complain being that we've used this insert to heat our 2000 sq/ft home for the last 4 winters all by its lonesome. So one local dealer gave me a price of $350. That amount of money is ridiculous for a fan of it's size. I've cleaned the fan blades out but that hasn't changed the situation. Has any body out there had similar issues and come up with a fix? Any aftermarket fan manufacturer p/n's?