The "pink tint" is not the only problem with Apple's 23" displays, by the way. There are several other defects that seem to be on all of them, such as washed out edges along the left and ride sides, dingy yellow edges, color inconsistencies, banding near the center and ghosting that gets worse as time passes. It doesn't matter when the monitor was made or what the serial number is. They're all defective.
So, be wary about getting on of these monitors until Apple addresses the defects. I had two 23" ACDs. While I loved the design of the monitor itself, they do not perform as advertised at all, and I had to return both of them.