Coralej
"Lets head to that dark room first, give it another check over, then follow the tracks. Anyone got a decent light source or are we stuck with just R4's sensors again?"
Once a light has been produced (or confirmed as unavailable) he'll lead the way to that first room.
Spoiler: OOCI'm pretty sure noone has actually told us Ax is called Ax by the way, which is why I call him R4 every time.