So I need some advice. My attitude indicator occasionally indicates a 10 to 15° left bank when visually I am wings level. This situation resolves on its own and only occurs sporadically. When the attitude indicator does show the bank error, it still follows any changes that occur from that point on... IE. turning 10 to the right shows a 10° difference turning 10 to the left shows a 10° difference. All of the errors I have seen online with the attitude indicators show them spinning uncontrollably. Any thoughts on this? And yes I do have a new vacuum pump.