When I had a gimbal problem with my M2PRO I tried several of the private guys on here for the repair. Most just wanted to replace the entire gimbal and camera. Another from Virginia or W.Virginia, I can't remember exactly, said he could do the repair. I paid him and he did try but it did not work so I sent it back. He tried again but still no good, so he said he would refund me. He never did, in fact never responded to my message to him after that.
In the end I sent it to DJI and it was done within ten day, in fact they just replaced my drone with a new one and it cost me $345 I believe. If I were doing it over again, I would only use DJI. Their labour cost is $65 which is on par or cheaper than the guys who advertise here. Do yourself a favour and just send it to DJI.