I have an old Apple bluetooth keyboard which i've successfully connected to my MBP. I works prefectly. As I type on it the Keyboard Viewer responds. I have a suspicion that the MBP keyboard(s) are alright but perhaps it is the connector. When I had the Apple Reseller replace the original keyboard he said the battery was swollen(bad), and was causing the trackpad not to work. I'm old school, and have always preferred the mouse, so wasn't aware the trackpad failed. I had just replaced the battery within the past year. The keyboard has never been a problem until early last week when T, Y, U, I, O, H, J, K & M keys failed. I assumed that a bit of W-D overspray got under the keys, but afer allowing it to dry for a couple days and the same keys remained bad, I took it in for a new keyboard. Since the new keyboard installation, new battery AND upgraded iOS to High Sierra, all keys on the newly installed keyboard between Q thru O remain unresponsive. I have a a sense that the next keyboard replacement will not fix the problem and that its either the keyboard ribbon connector? your thoughts?