The buttons failing are a common issue, very cheap and easy repair. 100 Series Button Repair How-To - A/C, Defrost, Recirc etc - https://forum.ih8mud.com/threads/100-series-button-repair-how-to-a-c-defrost-recirc-etc.1111051/
The rear cupholder comes out when you push it in, but it is common...