How much work is required to replace a heater matrix?

I have a 2015 Ford B-MAX and water is coming into the driver's footwell. Our nearest Ford garage (which has been very good and I trust) has told me that it is something to do with the heater matrix - either pipe or matrix and this is unusual. They tell me that it is at least five hours labour (as they have to remove put back the dash board), before diagnosis and parts. Would you agree as this seems expensive on a vehicle that has just been serviced at 26000 miles?
Any work on a heater matrix is very expensive because of the long time it takes to dismantle the dashboard to get at the heater matrix. Same with every car.
Answered by Honest John on

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