Then you should have a wiring for a harp-playing/tickling hexipal.
I do
Wire (You find an excess wire from Marekai's lair. On the computer.)
Vella's hexipal to the same harp-playing wiring and put the hexipal in front of the NavScarf. You can now access the control room and press the red triangle button.
You find an excess wire from Marekai's lair. On the computer.