Help needed pre-out

[Sorensen]

Hi. Im not sure if my 140 pro has got pre out installed.
But on the box it say: preamplified output and on amplifier screen  (the little round screen on top amplifier )   it say: standard stage 
Stereo pre out installed.

[thumb5]

That sounds fairly convincing...is there something else that makes you think the pre-out might not be fitted after all?

[Sorensen]

That sounds fairly convincing...is there something else that makes you think the pre-out might not be fitted after all?

I just have to make sure, because i am selling and the buyer need pre out