Elevators 96, 97, 98 and 99 will be out of service on Sunday, November 21st from 11:00 AM to 5:00 PM to install a new computer and to upgrade the software of the standby emergency power system. When upgrading this system, one Elevator will be taken out of service while the other three elevators will operate on emergency mode. This means that they will not accept hall calls but instead serve every floor on the way up and down, one car servicing even floors, whereas the other(s) will serve odd floors.