Just wanted to post an update to my saga...
Recap of the story so far: ordered first iPad air at release, had yellow tint on left. Replaced at Genius Bar, seemed ok in store, got home, yellow tint. Emailed executive relations and they collected iPad.
Then, a brand new iPad air was sent from China. Received today and the screen is perfect. No yellow tint, no blue tint, nice and bright, evenly lit. No dead pixels.
I'm very happy with the iPad I have now. Just a pity it took 3 tries and over a month.
As others have said, there are perfect screens out there. Just keep trying and do not give up!
For those that are interested, my 3rd serial is DMPLT8
Nice Name: iPad Air (WiFi)
Family name:
Group1: iPad
Group2: Air
Generation:
Colour: Space Gray
Production year: 2013
Production week: 49 (December)
Model introduced: 2013
Capacity: 128GB
Memory - flavour: xx
Factory: DM (China - Foxconn)