My "A" key is squeaking. Its rubbing internally when pressed. Feels very annoying, sorta of like nails on a chalkboard. And its started audibly squeaking as well. Is there a way to remove the key and see if I can lubricate it? It feels like either lubrication has washed away, or a slippery layer has worn through, or areas that are supposed to slip have developed sharp edges and its scraping now.