read my second answer..:)

From the first hallway of the old dungeon, take the first left. Now
keep going, ignoring the first path on your left, and enter the second
path on the left to find a chest. Now go back into the hallway and
proceed forward until you hit a fork. Turn right and keep going until
you find a chest, then turn left and move forward. Almost immediately
you'll find another chest to your left. Just ahead of the chest and to
your right is a door lock which you'll want to trigger. Turn left,
then keep going until you can turn right. Follow the path until it
splits, then turn right. Keep going forward, then enter the third
path to your right. You'll be in a circular room. To either end are
door locks you should trigger. Right in front is a third door lock
that will lead you to the Rusty Scalpel. Take it, and go back to
the guild for your reward.

yea....uhh the whole left and right thing is still pretty vague..

i am confused by what you said.could you make a map or something and post it?i am stuck on
this quest as well.