Page 22 of the online use and care manual for microwave model PVM92155K3SS is wrong, and you will break part of your microwave if you follow it.  There is a door in the top center panel of the microwave that tilts open if you gently pry the top edge forward with your fingertips.  Once this door tilts open, the charcoal filter is easy to remove and replace.  YOU DO NOT HAVE TO REMOVE ANY SCREWS TO DO THIS!!!!