I was talking to someone who had some stereo work done to his 99 M3 cabrio (E36). The shop can't figure out what they did to disable the top. There's a flashing light on the power top switch so hopefully there's a specific fault code. He's digging in for a battle with the shop to pay for an independent to sort it out. It'll either be something all stereo shops do wrong or 20 hours of diagnosis

Thanks,
Sixto
95 S420
87 300SDL