There is indeed a "back door" to the Firewine bridge dungeon:
Spoiler:
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Go to Gullykin and look for Jenkal's Hut. You notice an odd smell (kobold's???). Confront him and search his hut for a secret door. Using the secret door dumps you smack into the ogre mages room at the back of the dungeon!
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“Every tavern’s an opportunity, I say.”
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