Top cover with flash and buttons replacement

Hi there,

I am having issues with the control buttons and power switch after some fresh water ingress. It did intermittently work for a short period of time with some trigger button problems, and power up issues. I believe the top cover and buttons assembly needs to be replaced. I have found parts online and will need to buy some tools through ifixit. However, i have been unable to find a repair guide for this job online. The motherboard replacement guide found here only gets me so far. Do you have a repair guide for this job available?

Many thanks for any help you can give me.