In order to solve some of the problems encountered by some users, Apple decided to extend the warranty period of the original iPad Pro’s Smart Keyboard to three years.
Specifically, users of the original 9.7-inch and 12.9-inch iPad Pro’s Smart Keyboard can either repair or change it for free, as there may be issues with the accessories, including sensor and Smart Connector problems, key sticking, repeated input, no response, and more.
Prior to this, the warranty period for Smart Keybaord is one year, which has already expired for majority first generation of iPad Pro user. Normally, you need to spend $149-$169 to buy a new one.