Problems with Tektronix S-3270

Hello,

I'm using an Automated Test System from Tektronix which reference is S-3270 and I have a trouble with it.

I'm not able to read the good current on on all voltages VS5, VS6, VS7, VS8 that comes from the 1140#2. This is the only problem written on screen when I run a verdict.

The current has been checked on the plug J960 at the junction pannel 1804 from the outside of the 1140#2 and it is good. When I try to check the current from the card MC3 Current-voltage monitor with an amperemeter I don't read the good current, for example for VS5 instead of reading -28mA I read -5mA.

Does someone knows how to fix this problem? If not does someone know someone or a compagny that can help me to fix this, please?

Thank you in advance.