After doing some maintenance I have the good news that the fan is replaceable/removable (even if we currently don’t have an option to buy just a replacement fan) at least there is a way to clean the inevitable build-up on the heatsink.
To remove you must access the underside of the MOBO where you will find 3 Phillips screws in the fan housing, remove those then on the top side of the MOBO unscrew the two captive torx screws and finally there is some black tape adjacent to the fan cable which holds the two halves together, peel the bottom side up, unplug the fan and lift it out.
