When setting the LED_MODE=3 (A7 output and GPS on A6 on APM2.5) to reflect the status of the PRE-ARM/ARMED/DISARMED on A7, it does not reflect any pre-arm checks like the onboard LED. It it only blinks steadily even if there is a pre-arm condition present. 
Can this be easily fixed?
Sedim,
Ah, you noticed! I found that as well but I’m afraid that it’s too late to fix it for AC3.1. Feel free to raise an issue in the issues list.