Well, that is a bit unfortunate but still good news. If the repair sorts out the IMU issues and the GPS and you have a perfectly functional unit, you shouldn't be too cross. Also from what I have read, DJI don't usually repair your unit and send it back to you - they pick a refub unit from their shelve and ship it to you once they determine your unit is faulty and payment issues are settled. If they do send you back your AC, this will be a first as far as I am aware. And don't worry, refub units are as good as brand new ones.