Restarting the Navitor: Get the connection in Autumn.
The puzzle:
Whaddaya got that Vespasian ain't got?
Crawlin' through the wreckage.
Jupiter has something to relay.
Find in the light going up what you couldn't find in the dark going down.
1. Restart the Navitor.
The Kal. Sep. breakdown brings you back to Cornelius's study. Again, go to the double doors and get the note with the code number: 95. Go to the Autumnus table to the right of the desk, enter the XCV in the box, get the piece, attach it to the bolts, run the machine by clicking on the handle and holding the mouse button, and pull the knob. Find the Autumnus door to the left of the double doors. Set the switches at 1 down, 2 and 3 up, and 4 down. Remove the fuse from the bolts at the left to make the electrical connection; you'll see blue sparks. Back to the Navitor.
2. Temple of Vespasian/Finance Office/Relay Station (Id. Sep.)
You'll hear about an explosion at the Finance Office, allegedly caused by a thunderbolt from the Temple of Jupiter. At the corner of the Temple of Vespasian, at the alley near Sibyl's taberna, is a stone map with "Id. Sep." carved into the missing map area. Click on the marble piece you found earlier to fill it in. The door at the end of the alley opens. Enter and go through the door to find the burning Finance Office. Go out into the rubble, turn right, look down, and get the fuse attached to the wire. Turn around and go straight up the stairs, which transports you to a hill behind the Tabularium. Go left and up the stairs toward Jupiter. Look for a golden door with a wire leading down from the Temple of Jupiter. Open the door and follow the wire down the stairs, press the button to open the door, go down the hill, and go to the right, where you'll see a small building (the Relay Station). Enter the building and click on the fuse to attach it to the connector on the left (this lights the stairs you just came down). Go back up to the stairs and look in the right-hand wall (as you're going up) for a wooden niche, where you'll find a second fuse. Get it and return to the Relay Station. Attach the second fuse to the first, then pull the fuse on the right over so that it attaches to the ones on the left. At the left of the room, you'll see a switch; throw it, and the big box opens. Get the arch form, soldier, and scroll.