Has anyone had to go thru this warranty repair(27 page PDF) as recommended by the Mfg. Looks like there are a few issues with the design and performance on the Tundra model. I read about Cracks (front of stove), Auto damper retro-fit (reduction in inlet size), and Damper Saftey Control, Snap Disc Thermo performance(not working). Also, I see an issue with the Damper control rod hanging up and leaving the Inlet damper open 1/4". Any input or comments will be greatly appreciated.