1. Buy 3 new gimbal motors and install them yourself
2. Send it to someone here on PP and maybe they can repair the gimbal.
3. Sell the camera and gimbal for parts and buy a new camera and gimbal
4. Sell the wreck for parts and buy a new P3S
List it here in the classifieds or put it on eBay.
You should probably sell the whole gimbal and camera together.
I hope that if you buy just a new cam and gimbal that the motor overload message goes away. No guarantees. Thats why I said sell the whole thing and buy a new one.