My Eko 25 will be 3 years this heat season. Door leaks small amount of smoke. Would like to replace the door gasket and adjust the door. Book does not say how to Remove the door. I don't want to screw anything up by forcing anything or removing something that does not need to be removed. Can you just lift the door up and off or do you have to loosen or remove the large nuts? Also any suggestions about a new gasket. Thanks, Mike