I can SOMETIMES reproduce it by pushing on it...it's definitely the hood. The only solution I've read is to put some of those pads that go under furniture legs, stick 'em where the hood bumps rest. It helped w/mine a little but it came back. Then one disappeared...I need to find some more. Other than that, I haven't sat there and tried to pinpoint it...but it seems to come from the front, NOT from the hinges.