Out of the blue, I ran an Apple Diagnostic on my 2013 MBA and got this error:- PPT004 The battery requires service. The battery is not functioning normally, though you may not notice a change in its behavior or the amount of charge it holds. You can continue to use your battery before its checked without harming your computer. The MBA seems to run normally & battery life is quite good. The cycle count is only 134. If I Option Click the battery icon, it says Condition: Normal. What's next? My MBA is out of warranty.