I had a band done 10 years ago and just got sleeved (10 days ago). My doctor informed me there was a lot of fybrosis (I think that's what it is called) but he successfully removed the band and got the sleeve done. He did the leak test during the operation So far, there hasn't been any problem at all.
My doctor gave me a week and 3 days of clear or almost clear liquid diet. I just started eating Beans, egg, yogurt, etc. So far it's been great. I do take esoprax every morning to avoid reflux, etc.
My best advice to you would be: this is something you are doing to yourself, it's not a favor the doctor is doing for you, it's your life, plus it's not free. So talk to other people your doctor has "revised" or get a doctor that makes you feel better. In the end, it is your precious life that's at stake.
Hope it helps,
Maraki