That toilet is easily unbolted from the floor and then disconnect the water line. As you look at the back of the toilet, there is a large white assembly with hoses attached. That unit is the actual macerator. Don't attempt to open it up.....don't ask how I know.
The white assembly is removable. Disconnect the hoses and unplug the electrical. Take the unit outside and flush it via the openings. Once you think it's clear/clean, then you can disassemble the white unit to see if it's jammed.
Don & Mary
2019 Newmar Dutch Star 4018 - All Electric
2019 Ford Raptor Crew Cab