Hi @Jon Mullen,
You’re in luck.
Here’s the [https://elektrotanya.com/nad_t760_sm.pdf/download.html|service manual] for the receiver.
Be patient when going to download the manual as it takes a bit of time to go from processing to download ''after'' you have passed the security check and clicked on Go to Download, ''below'' the document preview box.
On p.6 of the manual, there are dis-assembly instructions and like all good manual it has all the schematics and a full parts list.
Hopefully this is of some help