Extract the audio from the CD using Exact Audio Copy or similar software. Open the file in your editing program, Soundforge, Audacity (free) other, zoom in on the diginoise segments (they are pretty easy to see in the waveforms.) Depending on whether it is one or both channels, your options are to copy and paste a segment from the good channel to the bad, or if both are bad, just cut the diginoise piece out. You will likely never notice. While you can hear it, it happens very quickly, and the edits are usually unnoticable. Hope this helps.