I'm replying to this old thread since I have same kind of issues with RUTX09 LED's.
With fresh installation, SIM1 and SIM2 works, showing active SIM card.
After that, I have deleted factory mobile interfaces and created them again with naming that suites better for me, example "SIM1_Telia" and "SIM2_Vodafone".
After this naming change, LEDs stopped working. Everything else is working fine.
There must be some kind of script that checks LED status with default interface names?
Could this be changed from some config file or fixed in future software releases to get status from some other source than interface name?
I'm running latest firmware RUTX_R_00.07.01.4