I just replaced the combustion chamber in my three year old oakwood. The dealer said that it was only guaranteed 2 years. Funny thing is that the new chamber is made out of a new material because the original didn't hold up.Have any of you had this problem? The way the warantee works (Which is to cover materials and workmanship for 6 years) is you contact the dealer and they contact Harmon. The dealer said Harmon won't cover the chamber. Any suggestions of what to do. It seems to me that if Harmon changed the materials used to make the chamber that the workmanship was inferior.