Heater matrix change

Anyone have decent guide/link on changing matrix please

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i seem to remember when I did mine I had to basically remove the dash, it was a pain but I just logically undid the nuts and clips etc holding it to the bulkhead until I could pull it out far enough to free the matrix

IIRC it was always said to be something like a 7 hour job for a dealer, due to the need to pull the dash forward!