A question about drone repair techs. Amazon states their “renewed” DJI drones are carefully inspected by certified technicians before putting up for sale. DJI we all know uses the word “refurbished” by certified technicians. How does a technician become certified? I'm not trying to be funny here but I'm ready to make a purchase and I think I would be more comfortable using the DJI store. Could be I'm making something out of nothing.