I just passed my part 107 test and bought a pre Owned phantom 4 pro. But when I got it I noticed these small cracks. I’m sorry that one of cracks having a red line its just so I could check if it was continuing to become bigger. I’m new to owning a drone and don’t want to have my drone fall out of the sky. I’ve been flying slowly because I’m scared to loose my drone that I just got. I just started up my drone business and I don’t wanna loose my drone while on a job. Any knowledge sent my way would be greatly appreciated.