Almost certainly not worth redoing to wav. There have been a lot of similar debates on the flac format vs the wav format. I am on the side of those saying that there is no difference, or at least no difference that anyone can hear. One experiment I saw was of a flac file that was inverted and then played simultaneously with the wav file. No sound came out! QED as far as I am concerned. That coincided with my hearing that there is no difference. The theory is that the compressed format must have some extra processing and therefore cannot be as good. I suppose that may be true but in my opinion the difference, if any, (that I can't hear) is a bit like claiming you have lost weight after a haircut - theoretically true but not meaningful.