With my 1996 MOPF1 R129 the central lock no longer works after a trip at just under 40°. I suspect that the key is synchronized, I did it again in all cases, but the second key does not work either. Behavior: When trying to open the car by remote control the lamp flashes to the mirror and handle green, when closing it flashes red. Otherwise, however, nothing happens. The pump of the central lock also seems to be running, one hears an electric motor buzzing at any time and with each attempt to open or close the tone of the engine changes briefly. Can I have a pressure loss in the system, how can I find that, there are typical places? Independently, the SL was about 100° warm, from when did the fan have to run? From the red area it was still clearly removed.