Problems with PixelChecksum

[Boolean0]

Working on a script which is trying to watch two specific areas onscreen with pixelchecksum. Below is a snippet where the problem is occuring. The first checksum ($checksum1) works fine through all iterations of the while loop. However $checksum2 fails to function when the area it is watching changes. Is the problem with Pixelchecksum itself or have I made a mistake in my If/Then/Else statement? Thanks for the suggestions.

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While $units > 14 AND $extras >= 0
    
    $checksum1 = PixelChecksum(215, 211, 233, 237) ;Reset checksum
    $checksum2 = PixelChecksum(123, 281, 301, 144) ;Reset checksum
    
    While $checksum1 = PixelChecksum(215, 211, 233, 237)
        
        If $checksum2 = PixelChecksum(123, 281, 301, 144) Then
            MouseClick ( "left" , 134, 293 , 1 , 7  )
            Sleep(600)
            MouseClick ( "left" , 165, 293 , 1 , 7  )
            Sleep(600)
            MouseClick ( "left" , 337, 274 , 1 , 7  )
            Sleep(6000)
            $units = $units - 1
        ElseIf $extras > 0 Then
            Select
                Case $extras = 1
                    MouseClickDrag ( "left", 134, 321, 134, 293, 10 )
                Case $extras = 2
                    MouseClickDrag ( "left", 166, 321, 134, 293, 10 )
                Case $extras = 3
                    MouseClickDrag ( "left", 198, 321, 134, 293, 10 )
                Case $extras = 4
                    MouseClickDrag ( "left", 224, 321, 134, 293, 10 )
                Case Else
                    $extras = 4
                    MouseClickDrag ( "left", 224, 321, 134, 293, 10 )
            EndSelect
            $extras = $extras - 1
        Else
            MsgBox(0, "GUI Event", "XYZ.")
            Exit
        EndIf
    WEnd
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WEnd

I did not include the entire code for the topmost while loop. That section functions perfectly.