How do I work the Sewer Levers/Bars Door Puzzle?

Hint 1 of 4:

It is a bit difficult to see what works in this puzzle.  There are 8 inner
levers which control the outer bars: 2 at the top and bottom and 2 at each
side.

Hint 2 of 4:

The levers control different bars depending on which bars have been released.
 A bar is released when you see a groove appear on it.

Hint 3 of 4:

There have been no clues within the game to help, so if trial and error
doesn't work, the solution is given below.

Hint 4 of 4:

Label the levers 1 to 8 clockwise starting at the top left.