Hello members

Playing Arx first time and its a terrific game though difficult and intelligent. Currently very close to the end, achieved mithril sword and dragon egg. I have chosed for a Good Cutscene following which a Side Quest is necessary to solve

Side Quest - "Find out who killed the important woman ghost in a grave, and bring their name to Arx authorities. Optionally, find through King Poxsellis's Grave for
goodies"

I have reached to the very end with a sign warning you not to go any further without the watchmen's instructions.
Started trying out all the levers including one switch (with arrow) and got the key, also a secret healing fountain at the very end.

Now, the problem is that the pathway leading to the room with the statue is still closed. I am stuck since all the levers are activated and nothing seems to open the portcullis.
I also came across a switch which was like a pressure plate (glowing red since one of the skill disclosed hidden traps) but nothing happens when I step over or double-click.

Secondly, there is one portcullis inside the lever maze some where around in the middle which also locked and no lever seems to raise that portcullis too. It seems that the lever to the King's statue room is behind this portcullis.

In short, there are 2 portcullis which are locked despite all the levers are active and tried.
The lever for the King's Statue Room and,
The lever in the middle of the maze with a portcullis.

NOTE: I have referred the guides and walkthroughs and all mention to Hit one switch
on the northwestern corner. It should open the pathway that leads to the room
with a statue inside BUT the problem is that the pathway is blocked by a portcullis and eventually a lever is still missing to open it.
The spell telekinesis also not working with just a rune active symbol on the top-right but the effect is absent. It happens only in this level.

Thanks. Any help is highly appreciated.

If you are still stuck, try page 54 from the unofficial guide thread listed below (switch 5,7,8,9). Kudos for the people who figured this out.

You actually have use four switches in sequence 1) Northwest room switch (5) right next two fountain actually has two settings, one open up the hallway to the statue room 2) switch in opened hallway (7) open access to south switch (8) 3)South switch (8) opens up access to switch (9) to the north of it 4) Last switch (9) opens up access to the statue room :

I still don't understand.