TOD LED display.

So my TOD works fine except that the LED for the left rear wheel does not light up. The right one does. That said the TOD works fine 100% rear at rest to 50/50 when slipping and the front wheel LEDs work fine. Anyone has seen this issue? Is there a writeup for it or suggestions to fix it?

Just drove the car and the LEDs are working normally again... I guess it was too cold for the LED to turn on this morning :)