All you need is an obd reader and a hammer! /s

In all honesty i did replace my porsche’s window switch myself by following enthusiast youtube tutorials. Buttons were falling off, naturally. Plenty of videos about the issue on 911s and 981s. Connector was like a regular pc connector and the panel came off easily. The bmw has issues with the rear controller. Will fix that myself as well since the “professional” didn't “detect” an issue.