I checked all 3 diod, i have 0,556 on this lonely on left side of PCB, and on right side, on this on the most in left i have 0,021 and just near i have 0,022. I guess the value is different because they are not connected on the same way.
I made some mesure of voltage :
Between the socket of the lamp and before diod, i have 2,15v
Between the socket of the lamp and after diod (or between both socket of the lamp) i have 0v
Between pin (4-5) of the red connector wich are used for the lamp i have 2,16v
Between pin (4-5) of the blue connector on the CPU (Zahlwerk serie) wich are used for the lamp i have 2,16v
Between pin (4-5) of the blue connector on the CPU (Zahlwerk serie) wich are used for the lamp i have 2,16v too, when the counter is not connected