[RodB]

You can try using an exacto knife (with a new blade) to gently cut a slit across the bubble with the grain, and maybe at a slight angle. Use a syringe loaded with thinned glue to inject the glue in either side of the slit forcing the glue to cover the entire bubble. Clamp the area. Mend the slit with a finish stick.

Some suggest to apply some heat, like an iron, to activate the glue, then clamp.