Seaquel
SQL Server error code

SQL Server error 8976

SQL Server raises error 8976 at severity 16, which marks a problem with the query or data that you can correct.

Table error: Object ID %d, index ID %d, partition ID %I64d, alloc unit ID %I64d (type %.*ls). Page %S_PGID was not seen in the scan although its parent %S_PGID and previous %S_PGID refer to it. Check any previous errors.
Msg8976
Severity16
Group8000–8999

Source: Database Engine events and errors