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There are 6 LEDs on the ms14. Their silksceen and feature is as below:

From Left to Right:

LED Wired Feature
WLAN AR9331 GPIO0 This LED is mapped as dragino2:red:wlan. by default it is controlled by wifi. see document /etc/config/system
WAN AR9331 GPIO17 mapped as dragino2:red:wan
LAN AR9331 GPIO13 Active LOW, mapped as dragino2:red:lan
SYS AR9331 GPIO28 mapped as dragino2:red:usb
Heartbeat Sensor_LED Control by the Sensor led pins in 2x8 connector, active LOW
PWR Power un-programmable, indicate there is power on board.

For how to use AR9331 LED , consult [1]