10 year O-2E that had my ACL replaced 6 months ago and coming up on my next set of LIMDU. I have arthritis in both knees making it extremly painful to climb ladders and remain on sea duty along with a back injury. I went through 2 years of treatment with no solution minus the replacement ACL (no change in pain). I would like to start the MEB process as I feel that I wont return to sea duty without the pain being a limiting factor. How should I proceed?