Its elevation is common found in many disorders must most usualy is alcoholic, viral, autoimmune or toxic liver damage. The most common liver disorders is fatty liver which can be found in healthy people, but usually is resulting from elevated blood lipids, overweight and elevated blood sugar. If ultrasounds didnt find anything and viral markers are negative then you have no reason to be concerned. YOu should treat it by changing dietary and lifestyle habbits. Do exercise, avoid alcohol,smoking, fats,fast food and carbonated drinks. Eat more fruit and vegetables, boiled meat and follow some of hepatoprotective diets. Findings usually improves on such measures. If not, then some medicines can be presribed, but I suggest to go step by step. ANA positve is nonspecific finding but it can be marker of some autoimmune disease, including autoimmune hepatitis. Also some thyroid and joints issue so just be caotious if you have any symptoms from this sides. Wish you good health.