Zone into Aydeewa Subterrane from E-10 of Wajaom Woodlands and make your way to G-10. There you will find two ??? points, one of which is at the top of a long staircase. You will get a CS when you approach the staircase. After CS, head to Nashmau and speak to Tsetseroon (the quest now appears in your log). Trade him a Cobalt Jellyfish and a Tin Ore and he will give you a key item. Return to the staircase in Aydeewa and climb it, examine the ??? at the top. During the CS you will have the option to select "Yes" or "I am no thief". I chose Yes and got the map, unknown if you can still get it from the second option. Return to Tsetseroon to finish the quest. He will give you an Imperial Bronze Piece. Based on the dialog, it looks as though if you don't steal the map he gives it to you either instead of or in addition to the coin.
Obtained: Map of Aydeewa Subterrane
Obtained: Imperial Bronze Piece