[S135U R Processor QVZ Fault]

I can I will check that. Thanks again

[S135U R Processor QVZ Fault]

Thank you! I have tried changing a couple I/O cards and it hasn't helped. In the first picture, do you know where I/O Byte 11 is trying to lead me to? I tried changing the IO card that uses I11.0 11.1 etc, but that did not fix it. Any chance it could be backplane issue? Thanks again for the help.

[S135U R Processor QVZ Fault]

I am getting a QVZ light. I opened ISTACK but I don't really understand what it is telling me. I've attached a couple screenshots. I'd appreciate any help.