Jabsco sells overhaul kits for some of its macerators. They are not hard to repair, pretty straightfwd. Let's put it this way, I could do it. Elsewhere it was pointed out that the macerator sometimes gets stuck and needs to be freed with a screwdriver, utilizing a slot on the outside at the front of the unit. There may be a cover over that slot.
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD