Sooooo I have a "friend".... who crashed his drone. And this "friend" sent it to be repaired by Drone Doctor. Part of the damage was the obstacle avoidance system. They have told my "friend" that DJI does not even sell a replacement part for it. I guess I, I mean my"friend", would have to send it to DJI directly. And let them bend me over. Has anybody run into this problem?