It looks like the skin DDS was painted in blue in these areas: try another skin to compare or open XXXbody.dds with gimp/photoshop and dds plugin to check how these parts were painted.
If it's not the body, it's also possible that this is a part of the chassis ( bottom ) calling a wrong texture.
Anyway it can easily been corrected if you're used to it.
Else ... ask in a private message.