I took a '92 400E for a test drive today. Nice car, very solid (85K miles on it) powerful too. After about two minutes of driving a strange chime/beep was coming from behind the instrument cluster. It lasted for about 25 sec. A couple of minutes later it was heard again. The dealer knows nothing about it. Anybody experienced this before? Thanks for your input. By the way, liked the car but the dealer is a dreamer.