Hi All, Recently had my first crash - total pilot error. I considered myself okay until this point! So the phantom landed on to concrete (ouch) directly onto the rotors from a few feet up. It flew perfectly straight after, no damage to the gimbal or anything like that. However I've become paranoid now, and wanted to run this by the forum - when I spin the motors (when it's off) two of the motors make very little sound, and two make a sort of clunking sound. I can't describe it - here's a video. Remember, front two motors are OK as far as I can tell, rear two are making a different sound. It flew fine straight after the crash. https://www.youtube.com/watch?v=dhCcmeYeudw I'm scared to fly it again until I replace the motors - if that's what is recommended.