Answering my own question. Duh! I discovered the clips. For others and posterity, the ticket is to disconnect the air intake cowls, take off the front piece (the one which surrounds the oil filler cap) and then lift the whole unit up. It is connected on the top of the block by spring tension type clips. Take it to the bench and flip it over and have at it. The filters are secured by screws on the underside.