HP-41 82161A HP-IL Tape Reader - Doesn't work anymore - Help Needed

[albertofenini]

Do you think it is normal that upper left and lowest left are almost connected ?
We looked at the manual but it is difficult to understand the position of the components
Is there any testing point like in some of the calculators we have repaired in the past ?

Since it was working as of lunch time today and it doesn’t turn even on I think it has to be something macroscopic related to power supply that’s why I’m interested in understanding where the voltages should be available and how much the values should be