D5 – 205 HP: Recurring low coolant loss

Hello driver of the above engine, I checked the car (V70, 12/2010, approx. 48000km) about 1 week ago a recurring minimal (0,2 – 0,3 Ltr.) coolant loss. My friend checked the car (V70, 12/2010, approx. 48000km) but could not discover any cause. During the 2nd attempt he had a message from Volvo, which described the problem and asked the workshops to write a detailed report. After my friend had done this, he received a call from Volvo Deutschl the next morning. and, with the release for a new engine. My engine should be sent back to Sweden immediately to investigate the cause. If I receive feedback from my friend, I will share it here. Who has similar experiences?