The top of the re-entry control system section. I'm not certain what the
device is there at the top. It does look somewhat similar to, but still
different from, the guillotine assembly
counter-clockwise from its position.
If you examine the forward end of the re-entry
control system section, the two guillotine assemblies do appear to be
situated approximately 1/3 of the way around the circumference, so it would
make sense that this would be another. However, I can find no reference to any
guillotine assemblies in these locations, so I'll not speculate any further.