HappiJac slide-out adjustment

[bureaunh]

Hello,
We have a 2010 Dutchmen28B-GS travel trailer.

I noticed a few weeks back that the kitchen/couch slide out does not sit flush with the outside wall in the front when the slide is in. The back of the slide is OK, but I can fit my finger the whole vertical length of the slide on the front.

I took some paneling off under the couch and saw that I have a HappiJac SecureTrack system. Any ideas on how to adjust this? I went on their web site and it says to "Simply pull and hold the spring-loaded drive shaft to disengage the motor and manually advance or retract the drive mechanism of each rail independently."

I guess I'm a picture kind of guy because I can't see where to do this.

Any ideas?

Camper has been great otherwise.

Jim