Daeth yr Athro June Andrews a Mark Butler, a gynhaliodd yr adolygiad cychwynnol o ofal yn y ddau ysbyty, yn ôl i Gymru i gynnal yr asesiad annibynnol o gynnydd yn erbyn yr 14 o argymhellion a wnaed yn eu hadroddiad gwreiddiol.
Professor June Andrews and Mark Butler, who undertook the initial review of care at the two hospitals, returned to Wales to carry out the independent assessment of progress against the 14 recommendations they made in their original report.