i used an old coat hanger to create two 'U' shapes. There should be two holes on each side. Slide the 'U' shape tools you just made into it and it should just slide out.
bout 3 to 4" nails. all need to be done at the same time.
once u get the unit out u can see y there are small hooks holding the unit in and by putting the nails etc into the holes you are pushing the clips back so u can slide the unit out