Boogie MkV:25 effects loop issue

[tayistay]

I've noticed that my MkV:25 has signal bleed to the power amp, even when the effects return is silence.

Here's a video demonstrating:

https://www.dropbox.com/s/yo7vwjss9njvnub/IMG_1215.MOV?dl=0
Could a tech improve this? (It's causing problems with my effects setup)