Cybros? If you are looking in the data files, it should be in void campaign under story sets. It comes completely opened up from what I have seen (like when it fires on the planet).
SMX2_Cybros,m3 in the story sets isn't that it?
Thats what I have, its animation also closes back up and what not.
the "Stand" animation is it opened up the "Stand 01" animation is it closed like normal