At the deepest of the Den

Introduction

Since you seem to have won the trust of the Archduke, I'll give you mine. There is indeed a way to repair the elevator, but you will have to get help from a wiseman with sufficient knowledge in many fields, including engineering. Come back when you have recruited a suitable assistant, you will need it, I assure you.

Cunclusion

You found it? Great! Now we can move on to the serious part.