Where is the vault on the island?

Hint 1 of 7:

You should have seen two half-pages in your quests up to this point.

Hint 2 of 7:

One was in Achenar's (death/blue pages) room in the Stoneship Age.

Hint 3 of 7:

Look in one of his drawers for the page.

Hint 4 of 7:

The other was in Sirrus's (greed/red pages) room in Channelwood.

Hint 5 of 7:

It was in a drawer underneath his bed.

Hint 6 of 7:

If you put the two halves together, you should have the instructions for
finding the vault.  Well, that is if your version isn't one of them with an
error in the text.

Hint 7 of 7:

The proper instructions should read something like: "Turn every marker
switch on the island *on*, and then turn the switch on the dock *off*."