Tascam 312b Aux issue

[Ryal1]

Hello, I’m hoping someone can help out here. It appears aux1 is not working on post fader mode. Is this an easy fix? Aux2 works as it should but I have tried to troubleshoot aux1 on my own and have t been successful.
Thanks

 

[sweetbeats]

I’ll ask you the same question I did on YouTube...is this happening across all channels? Or just one? Or some?

 

[sweetbeats]

Just replied to your reply on my YouTube video...AUX 1 is pre-fade only. The POST switch applies to AUX 2 only.