found this in the docs: Maintenance Alarms for Avaya Aura® Communication Manager, Branch Gateways and Servers
The maintenance software for Emergency Transfer monitors the position of the Emergency Transfer switch(es) on the EPNs’ Maintenance circuit packs. It does not monitor whether the system is actually in Emergency Transfer. Emergency Transfer (ET) provides the ability to connect designated analog phones to CO trunks when the switch cot provide minimal telephone service. Emergency Transfer is automatically controlled by the system or can be manually controlled via the Emergency Transfer switch located on the Maintenance circuit pack. A manual ON position (up) generates a Major alarm. A manual OFF position (down) generates a Warning alarm. Unless a technician is currently working on the system, the switch should be left in the auto position.
b.Error Type 1: the Emergency Transfer switch located on the Processor circuit pack is set to the manual ON position (up). When the Emergency Transfer switch is in this position, a Major alarm in generated.