Yeah sounds like your pump has gone bad. You can replace it with the Attwood Tsunami 800
or the OEM Malibu Shurflo Piranha 800 Pump
as they both have a 3/4" inlet and outlet.
Your drain pump is located under the floor toward the rear inside corner of the compartment. It is kind of a pain in the butt to change because 2005 was the only year that didn't have a small removable panel in the floor . You will need to find all of the screws in the floor and lift it up. It is easy but just takes some time.