I have a BG-E11 grip for my 5D Mark III and loved it until the small plastic piece that goes presses into the battery flap broke, preventing it from being able to be turned on. I should've superglued that piece back, but instead sent it in for repair. When I got everything back from checkup/repair, I no longer had/have a battery door (was attached to grip). Furthermore, the rubber has begun peeling off and expanding. The question being, is it possible to fix this on my own or do I need to send it to Canon? It's usable but very annoying as it is extremely loose around the shutter button and air bubbles are underneath the entire front edge of the grip. If I do need to send it to Canon, would it be covered under warranty from previous repair or would I be paying for this? If paying how much? Any info on this would be a lot more than I have now!