IF( isnull(Caseclosedyear) and not isnull([Caseraised year]) and [Case status] <> 69, 'Open',
IF( not isnull([Caseraised year]) and [Case status] <> 69, 'Closed',
IF( not isnull([Caseraised year]) and [Case status] = 69, 'Cancelled','Other status')
)
)