Harmy said:

If the print had a pink colour shift, colour-correcting it might have made the whites slightly creamy/yellowish. Or they're just faded...

Well now, that's the trick, isn't it? How do you know what it is supposed to be? I did do quite a bit of color correction on the PG, but without a reliable reference source, it really comes down to a judgement call. Also, there is only so much color correction you can do before it starts cutting into detail and making the faces look sickly.