In 2015, I replaced the screen in my mid-2007 MacBook. In 2016, I replaced the logic board (to fix a problem with graphics chip) on my mid-2010 MacBook Pro. I've also twice installed SSD drives in the MacBook Pro, plus installed more RAM. In 2017, I replaced the battery in my 4th gen. iPod. And in Dec. 2018, I replaced the battery in my iPad Air Wi-Fi.