Something you can do with soundforge is copy the good channel and paste it over the shitty channel. When I was using the analog line in on my DAT sometimes one channel would lose signal (fixed this by jiggling the cable) so I would do this to make it sound better.
This function is under the TOOLS menu on the top tool bar. So click on TOOLS, scroll down to REPAIR, and then choose COPY CHANNEL or something like that. You should be able to choose which channel you want to copy.
So ya- just copy the good one and paste over the bad channel.
Also another quick tip...under TOOLS there is a function called export regions. Once you have tracked your show and converted markers to regions you can extract each region to a new file. This is much easier than copy and paste. Even easier if you extract the regions you plan to put on each CD to a new file. Then you can just add the whole file to your burning program instead of adding each song.
Good luck