Analogue-sequencer

Hi can anybody help, i don't know what happened, but these LEDs aren't
working anymore.
First 5 to 8 where also not working, but they work now again (after
the maschine was on 3 minutes) is there in the maschine a simple
contact which isn't good anymore, I don't think the LEDs are defect, i
think it's just a contact, but i don't know where.
Everything else, alle the functions are working correct, just those
lamps are no more blinking...

thanks for help