Callback actions SL500 R230

Hello Forum municipality, intend to buy me in the next few days a SL 500 R230 from end 2002, German model. The car has run just over 70000 KM and is from second hand. The first owner has driven it for about 9 years (second vehicle ) The now wants to sell it again, there are now many positive or negative reasons. I will certainly not get the true reason! The known defects / recall actions are known to me and you can then also So here are a few questions: The initial problems with the SBC brake were a recall action by Mercedes and all vehicle holders were written in and the defects were fixed? I can assume that this vehicle is in order with the SBC brake? Should certainly be noted in the service order? The ABC chassis also received a recall action around 2009. Have all been invited there by Mercedes and the defects corrected? Oil verl The question is whether the serious defects on the part of Mercedes were fixed and also wrote to them? Since the car of my interest was only 2 times at the service in the last 9 years (I think 30000 u. 60000 KM ) he was probably the last 2 or three years not in a contract workshop. And I would be interested by SL500 R230 drivers here in the forum, whether everything is really so bad or will be with the SL500 R230……. Greetings and thanks