Zinsco panels are known to cause fires in homes and businesses every year. This panel is in an apartment building where there has been multiple issues with overheating electrical connections.click here for Zinsco panel info.
I actually felt sorry for the apartment complex. This large complex had scores of thirty year old Zinsco panels causing intermittent problems. In fact, the electrical problems had gotten so bad that management had permanently closed down several apartment units until repairs could be made.