I too had a crash and my gimbal stopped working, but camera video was fine. Inside my Parrot Anafi, I found that there are four connection sockets running from the gimbal motors to the circuit boards. I went through the process of disconnecting and reconnecting all 4 of them. It was probably only one loose connection, but I didn't want to take any chances. Gimbal works now!
But be careful! You have to take the unit almost completely apart (but maybe you can spot an obvious disconnection and fix it fast without too much work?). You can easily damage the internal electronics if you are impatient. Disconnect the battery before doing anything. Use your warranty if you have one. I got my unit used so no warranty for me. The final fourth connection near the camera can be accessed by slightly bending the plastic panel covering it, but again be careful and use good patient and firm but gentle judgement. I nearly ruined the connection for one of the motors to the main board.