Hi @npoleelf87 ,
Here’s a link to the ifixit [guide|18738] guide.
This will help you to gain access to the [https://www.ebay.com/c/1062725867|Volume and Power button flex cable -example only] (see Step.7) so that you can inspect it for any damage or loose connections etc.
If the cable is damaged or faulty, there are other suppliers that may suit you better. Just search for ''GT-P7510 Power/Volume button flex cable'' to get results.
I suggest that you also check out the [guide|18432] guide so that you know how to disconnect the battery as soon as you have access to it so as to not cause any electrical problems if you accidentally slip while using tools etc when the tablet is open. You don’t have to remove the battery, just disconnect it from the systemboard. Don’t forget to reconnect it after you have found the problem, last thing before before closing the tablet
First rule in electronics testing/repair, ''battery off first, on last'' when working on the circuit, unless you have to do “live” testing of course ;-)