I'm not going to go back through 73 pages, but the sound issues with Going For The One are pretty well known, and I think we've discussed them before. Eddie Offord had been their engineer and producer since 1970, but was replaced by a guy named John Timperley, assisted by David Richards. Yes did the production themselves, which was a first for them.
It's not in the Wiki for this album, but I know I've read that Eddie was actually replaced partway through the recording. So some stuff was already recorded by Eddie, who had the habit of applying Dolby noise reduction. Pretty standard back then, Dolby basically boosts the high end, then when "decoded" applies a complimentary de-boost to the high end, with the net effect of cutting noise. What wasn't standard was that Eddie never labelled the tapes. So according to one theory, the new guys taking over the recording and later mixing didn't realize that some of the stuff had had Dolby NR applied. Listening to it now, it's almost painful how much high end some of the parts have. But the master tapes have been lost, and what we're left with is a mix of tracks with and without Dolby, which is basically impossible to reverse engineer to deboost only the Dolby tracks. Maybe if you could go back to the masters and (hopefully) figure out which ones have Dolby applied and which don't. But no one can find the master tapes.