volume and power button not working

@rock77344 volume and power button are on the same flex cable. That is where the micro-switches are. Sounds to me like you need to replace that flex. Since iFixit does not yet have a specific guide for this, use something like this video Replacement flex cables are readily available at many online stores.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!