Bolzano.....not worth the effort, I've had several, made good service until poor performance...internals are cheap materials...not made to repair. I have a new one in box ready to go, when in service one dies.
May I ask exactly what needs to be replaced/rebuilt, motor, impeller, shaft, shaft bearings, seals or electrical bits? Never actually heard of that type of pump before, did you buy it here in town? Omega Trading (South Road, opposite side from Avon Cosmetics etc),sometimes also have parts that are difficult to find.