Weclome to the forum, Dunyain <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />

Levers: Several combos are possible. Did you try leaving via teleporter stone and returning then? Raze said, this puts the levers back into original position.
The trick is: NE and SW have to be down (NW and SE must remain up, don't touch them) and then you flip the middle lever. This closes all doors and then the deed room is open.
Elliot says IIRC: If the levers are crosswise up (NE, SW) and crosswise down (NW and SE) this works vice versa, too. Then flip the middle lever.

Door: Press ALT then move your char to the door, keep pressing ALT. If the door is highlighted in grey and your char is near enough (he vanishes) click on the door.
Kiya