That's pretty easy to patch. A couple of thoughts.
Drill a small hole and insert an endoscope. (see link) Small holes will be easy to fill.
Or, get a cat from a neighbor or local asian restaurant or food supplier and see if they ca narrow down the area. Then try the scope. Cut a larger hole when you find it, or stick in a n immersion blender, then vacuum out.
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In response to this post by MrBayAreaHokie)
Link: Eleven bucks
Posted: 07/12/2019 at 2:02PM