Not sure if this is useful, but we traveled from 8/26/2013 to 10/16/2013, putting on about 9,500 miles. Without a tow vehicle. So almost every day we ran the slide in and out, and the pop-out worked like it was supposed to every time. Our rig is a 2007 2551/s.
From Aug 2012 to May 2013, we lived full time in the rig, traveling some, but staying put for a lot of that time, except for the period of mid-Jan 2013 to late Mar 2013, and during that time, the pop-out was exercised regularly.
When we were originally shopping for a motorhome, we really didn't want a pop-out because of all the supposed problems, but we fell in love with this rig, so decided to chance it. Haven't regretted it yet. (Knocking on wood vigorously!!!)
Hopefully your problem is just a minor inconvenience.
--GeorgeB