My bird did a critical landing in field with about 8 inches of grass. When I recovered my bird, it was physically undamaged and had landed perfectly upright. When I tried getting her up in the air again, it asked me to recalibrate compass, so after 6 tries and degaussing it, finally got the compass in 1500 range. I also did IMU calibration and tried to fly. It then gave me ESC status error, I restarted controller and aircraft several times and error continued. I checked motors, all spin freely with no debris/grass entangled in them. From reading other posts, i understand it could be weak motor (s), or bad ESC which means to replace board. How do I know if a motor is bad or if it is ESC?