I’m sorry to disappoint you, but at the moment, the MHM (militärhistorisches museum) is a construction site, so you won’t have access to the T72 bridgelayer. The exhibit is in the outside, and they have closed this area (and most parts of the interiors as well). The only russian tanks are a T54 in excellent condition and a SU-76.
Because of that reasons, I would recommend you to phone the msuseum http://museen.smwk.sachsen.de/00000031.html
and ask if the museum is completely opened again!