Repair a water damaged kitchen base unit WITHOUT removing granite kitchen worktop

How to replace water damaged kitchen counter without removing the Granite Kitchen Worktop. Over the Christmas period I had a leak in the upstairs bathroom. The resulting water damaged the kitchen unit underneath the kitchen sink. The units needed replacing but the worktop is granite and could not be lifted off. Projected used 3 sheets of 18mm MFC - Melamine Faced Chipboard 2500 x 600mm and a new cabinet door from B&Q 0:00 - When to replace a kitchen unit 0:58 - how to remove a kitchen unit. 3:21 - how to restrain up a counter worktop 4:08 - How to build a kitchen unit 7:10 - how to fit a kitchen door