To the OP: What are the last 4 digits of the VIN? Anything below ~5500 is suspect for the torque converter / trans failure issue. I'm not doubting your friend, just saying that what we've observed of the RS6's we've all seen from years on this board. The torque converter is rated for higher TQ values than the transmission. The 5HP24A was originally touted by ZF as "lifetime fluids", and claims of 600lbft torque daily. They've since changed their tune, no longer saying anything about torque values, and surreptitiously putting out a tech bulletin notice to OE's that fluid should be changed every 60k miles/5 years or shorter for "harsher driving conditions". More to come, and welcome! I truly hope you enjoy your RS6!
O_E