Few random thoughts, some perhaps useless:
Liver is not such a small organ, and I'm thinking here, they can't possibly biopsy every part of it to check for abnormalities... Maybe ultrasound first? A biopsy should be avoided at almost any cost.
Hydrocodone, if pure (without paracetamol), is not that liver-unfriendly. Maybe try and drop tramadol. Doesn't the hydrocodone cover all the things tramadol does for you? Unless baclofen is really beneficial, I would drop that as well.