Question about ASUS ROG Swift PG259QN

I received it today and I have a yellow cast on the image. I have tried calibration from several sites such as tftcentral. I also have a PG279Q that I use for comparison, and the PG259QN looks absolutely no match. Although every site raves about how perfect this screen is out-of-box, I unfortunately got one that has this yellow cast. (It's not backlight bleed, fortunately I don't have any of that). http://www.lagom.nl/lcd-test/black.php On this page I can't see no.1 no matter what I set it to, and no.2&3 I can only see if I set the settings strongly for them. Means gamma e.g. on 1.8! Even my several years old BenQ, also for gaming, has no colour problems. Except for the usual ones, since it's a TN panel. I can't find a solution to this other than setting red and green to 75 and leaving blue at 100. I've written to support and hope we get a solution, if not I'd also be glad that the replacement is at least not too tedious...