Hensoldt is a division of Zeiss and Zeiss Jena was bought by Docter Optic. I don't know if this helps, but it's where I'd start if I were you. Often, German companies are pretty good about repairing their older stuff if you pressure them, however the cost is often quite high and may exceed the value of an older scope. Expect to pay in advance and be prepared to wait three or more months.
Rich or poor, it pays to have money.