Classic crack area #1 is near the pickguard and here is a good example. It appears to the run the length of pickguard and then some. This is an area with a lot of stresses and is also most prone to getting whacked. Once that pickguard’s off, we’ll take a closer look at this.
I spotted a few more. You need to search every inch of the surface–especially so when you have grain like mahogany which could be hiding all sorts of little splits. Also check all edges and seams. Guitars of this age often have problems with binding coming away or disintegrating, so check that out too!