Yes, my Parrotlet has an issue with beak overgrowth top and bottom. He was seen by one of the best Avian Docs around Greg Burkett in March and had two extensive blood panels run. Nothing came back with anything with his liver. He does not have AFLD. He did however have some elevations in kidney function and low calcium.
His beak had been examined under bright light in a dark room. There is discoloration present underneath the keratin, but that has been there since 2002 and it was once questioned by his breeder. His beak issue did not start happening until mid summer of 2007. I was sincerly hoping I'd find an answer from "Dr. B" as he's known, but he had nothing to share and found it also odd.
I trim the beak myself, the Vet shapes it. Growth happens as fast as 4-6 weeks before it needs to be trimmed again. He has not been on a seed only diet at all, he's been on Harrison's lifetime fine since 2002 with very little seed mixed and and never gets sunflower seeds. He has always had fresh or frozen veggies, now it's all fresh mixed in with beak appetite veggie delight.
Today, he gets cooked and fresh veggies and fresh fruit. I also give him a warm mash of the crumbles from Hagan Tropical pellets. I also add cinnamon which is good for diabetes and bee pollen. He eats red and blue fruits such as blueberries and strawberry's (his fav) which are full of antioxidants and vitamins. I bump the calcium up by scraping cuttle bone over his warm mash. His quality of life is great, he's my special needs guy. He's in great feather, plays, chirps, flys around and is his usual self.
I now watch proteins in lieu of any kidney issues, to help them not work so hard if there is an issue. Droppings are normal as they can be.
He will go back to the Vet in the spring for a check up again. But for now, I manage and take the best care of him. He hatched June 30th 1999 and he's over 10 and has been with me since I got him at 6 weeks.
His picture is in the check in thread.