Got a P4P back from repair today and as happened to many, its not the aircraft I sent in. I'm not sure if its new or not. Had all the stickers over sensors etc. Anyway, I can't seem to link the aircraft with the controller. I went through the process according to the instructions they sent me, but the light on the aircraft remains red. I took it out for a test flight and only about 100 ft away and 50 ft high and all seems well, but afraid to do anything else. Isnt the light on the aircraft supposed to be green too as well as the controller? Appreciate any help!!