Lower Yoma Valley - Map hole to forest and mountain grey in area below lower chest; in several places in upper right as you enter there are passages through the mountain borders into the grey, trapped no movement possible - unless teleport instantly will crash game. Also there is one in the upper spider area forest.
Yona River Headwater - map bug: map blank (unexplored), enemies renew, chests remain with contents - you can generate unlimited powder cages and wolf carcasses with repeated entry.
Passing through the mayor's office into the large room with the two large browish wardrobes - clicking on the one on the left causes crash with bad address. The one on the right may also.
Thanks for the info, I will start looking into it this afternoon.
I've found the steel door and stove in Lower Yoma Valley and an other end(?) in Broken Blade, the Frozen Key in Dunmore (which can't defrost - unless that has something to do with the stove), and Key bits (only once, but I do not remember where or who is the "friend" to see) - I have no idea what to do with these things as no NPC seems to know anything. Runing Level 22 with cartography at 17.
The two doors you have found do in fact lead to seperate places (there is a third as well), each of the three maps with the doors have either a key or key pieces to find, all of which need something doing to them before they can be used to open there respective doors.
For the two keys this something is in the same map as the key, for the key pieces you need to travel to another map to deal with (the friend mentioned for them is Keebo who will likely be the first npc you met in the game).
I have no idea how to get to the stairs down to the room with the two guards and the switch in the sewer.
Those stairs lead into / from the basement of Port Kuudad Tower.