Streak on display

Bought the HD Cinema display under 2 years ago, it is my primary display and sits beside a 15 year old Taxan 15" cheap plastic trimmed secondary screen.
Whilst the Taxan has worked flawlessly over the years, l see that my Apple HD Cinema screen contains an ever extending streak behind the glass. It looks like the sort of stain you would see on a water damaged book.
The screen has remained in the same location since purchase, has only ever been lightly cleaned with a duster and definitely never been any fluids/liquids.
Has anyone else had the same issue?

I have the same problem. Only appeared this week. Did apple have an answer to why it would happen?

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    INSERT [dbo].[teamResult] ([TeamID], [SeasonID], [ResultID], [dateGame]) VALUES (2, 1, 2, CAST(0x01380B00 AS Date))
    GO
    INSERT [dbo].[teamResult] ([TeamID], [SeasonID], [ResultID], [dateGame]) VALUES (2, 1, 2, CAST(0x02380B00 AS Date))
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    GO
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    GO
    INSERT [dbo].[teamResult] ([TeamID], [SeasonID], [ResultID], [dateGame]) VALUES (3, 2, 1, CAST(0x15380B00 AS Date))
    GO
    INSERT [dbo].[teamResult] ([TeamID], [SeasonID], [ResultID], [dateGame]) VALUES (3, 2, 1, CAST(0x16380B00 AS Date))
    GO
    INSERT [dbo].[teamResult] ([TeamID], [SeasonID], [ResultID], [dateGame]) VALUES (3, 2, 1, CAST(0x17380B00 AS Date))
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    INSERT [dbo].[teamResult] ([TeamID], [SeasonID], [ResultID], [dateGame]) VALUES (4, 2, 2, CAST(0x14380B00 AS Date))
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    INSERT [dbo].[teamResult] ([TeamID], [SeasonID], [ResultID], [dateGame]) VALUES (4, 2, 2, CAST(0x16380B00 AS Date))
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    INSERT [dbo].[teamResult] ([TeamID], [SeasonID], [ResultID], [dateGame]) VALUES (4, 2, 2, CAST(0x17380B00 AS Date))
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    row_number() Over(Partition by SeasonID,TeamID Order by dateGame)-
    row_number() Over(Partition by SeasonID,TeamID,ResultID Order by dateGame) rn3
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    ,mycte1 as (
    Select SeasonID,TeamID,ResultID,dateGame, rn, rn3, Case WHEN ResultID=1 Then 1 Else -1 END as PositiveOrNegative
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    Select a.SeasonID,a.TeamID,a.ResultID,a.dateGame,Sum(b.PositiveOrNegative) as [actualstreak]
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    AND a.ResultID=b.ResultID
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    Order by SeasonID,TeamID,dateGame
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