RFoudy,
I have the procedure written now and it works. However one thing that will make it more complex is if you have groups that need the line colors changed. It can certainly be done but I would need to debug it a little bit. Right now I have skipping over groups and it worked 100% for the sample you sent me. Let me know if this is not an issue and if it isnt I will post it with some explanations and you will be all set.
EDIT
I will post it now and if you want we can go over it
Code:
Sub ChangeLineColor()
Dim sld As Slide, shp As Shape, GrayColor(1 To 2) As Long, Arr As Byte
Dim CheckColor As Long
'Set GrayColors
GrayColor(1) = 10921638
GrayColor(2) = 12287562
For Each sld In ActivePresentation.Slides
sld.Select 'not necessary but fun to watch
Debug.Print sld.SlideIndex 'again not necessary but useful if errors
For Each shp In sld.Shapes
If shp.Type <> msoGroup Then
shp.Select 'not necessary but fun to watch
CheckColor = shp.Line.ForeColor.RGB
For Arr = 1 To 2
If GrayColor(Arr) = CheckColor Then
shp.Line.ForeColor.RGB = 12287562 'Change to blue
End If
Next Arr
End If
Next shp
Next sld
MsgBox "done"
End Sub
Let me know if that works. As with all code be sure to back up your work before running it because you cannot undo a macro.