How do you replace the headlamp assembly on my 2014 cts awd couple

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How do you replace the headlamp assembly in my 2014 Cadillac CTS awd coupe ? My headlamp is full of condensation & the repair shop told me it is very common for this year Cadillac, which made me very sad ! I love my car & to hear such a thing about such a well built machine is a little disheartening .