If
the outer (face) plies have not cracked or torn, there is hope. Glue can be injected/spread into the failing area and clamps can be applied (with form-fitting cauls) to reintegrate the separated plies. Any loose pieces should be carefully (re)positioned during this process.
There was discussion a couple of years ago on this issue; I think Koen had some good ideas about which adhesive(s) to consider.
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