Fired up the 3 year old Acclaim tonight for first time in month. Expecting a hard freeze. When I went to add wood later there was a crack extending horizontally across the glass front. It must have heated too quickly with the dry locust. It doesn't seem to be allowing in air or affecting the draft. Is this something that can be lived with, or am I looking for trouble? Aside from the dealer, are there any online sites that sell these replacement parts? Thanks.