Channelwood Age -- Where to find lever.

Go back to where you started on the second level, in other words, at the elevator from the first level (if you can find our way back). Then use the right-hand maze rule, which means if you can always turn right, if you can't then go straight ahead. This is the shortest route to the lever. Look closely, it may be hard to spot.

Go back to Channelwood Age -- How to unlock the door to stairs.