Call the Central Service Call at extension 11 or report the damage electronically with a ticket to Division 3 - Facilities Management of Technische Universität Braunschweig. Ticket system
Responsible for renovation and conversion is Department 35 - Building Construction and Maintenance
Please send inquiries directly to the head of the department by email. abt35(at)tu-braunschweig.de
I can find the appropriate form under Forms and downloads