The following code should work for the second YG raid zone, when placed in _User_MapStyles.xml
Code:
<ImageStyle Name="exp22_dun_yon_gorroth_raid_02" displayname="Yon Gorroth: The Infinite Abyss [Raid]" zonerect="-1482, -1126, 1210, 878">
<ImageFrame Source="images/maps/map_exp22_rgn_yon_gorroth.dds" SourceRect="0,0,800,600" />
</ImageStyle>