I have a Rayburn 200SF solid fuel cooker. The bottom firebrick are deeply pitted, and I think they should be replaced. I can buy the firebrick online, but I can find no instructions/information on DIY replacement. Also I have no idea whether it is possible to replace just the pitted bricks or whether all should be replaced at one time. Can anyone tell me whether this is a reasonable job for an average DIYer and/or point me to information on how to go about the job? Many thanks for any assistance!

- Jim