“The camera shakes” is a useful starting point. Adding when it shakes, what changed beforehand and whether the original recording shows it can make the first conversation with a technician much more productive.
Capture the symptom
Write down the aircraft and controller models, the exact warning message and the last time the system worked normally. If you already have a recording of the fault, keep the original file. Note whether the issue appeared in the saved footage, the live preview or both.
Prepare the handover
List the items you plan to send, including the controller, battery and any removable accessories. Photograph their condition and ask which pieces the technician needs. Back up personal footage and agree on how you will receive the estimate before repair work begins.