While my King has been burning well,I've noticed that my glass gets a thin rusty colored smokey film in two locations. Left side starting from the top corner of the door 6 inches in length and at its widest point 3 inches.On the right side from top corner down the same scenario only its 8 inches in length and 4 inches wide. My wood is all good MM checked nothing over 19% generally averaging 16%. Now upon inspecting the door, I noticed in both locations mentioned that part of the door gasket can be seen,is this indicative of where I may be sucking air?I also skirted the doors perimeter with a charcoal grill lighter and at the locations the flame flickered and sputtered . What do I have here and what are my options. My stove was bought in March 2011 and this is my real first year burning. Thanks, PS the film I'm describing can be removed in less than a minute on both sides it's light and powdery.