If just raising the back of the sled doesn't get the bubble out, then put a 4x4 wooden block under the right ski, then raise the back of the sled. It should run the bubble right back up into the tank. By the way, the very next time that you make a hard left turn with a low oil tank, or sidehill to the left with a low oil tank, etc. (I think you get the picture) the bubble will re-appear. There simply isn't enough "drop" from the tank fitting to the pump, combined the oil being carried in a very wide tank. Having the fitting on the oil tank all the way to one side doesn't help either. It wouldn't surprise me a bit if we see the oil tank fitting in a different spot on the 03 F-Cats. Or at least a baffled chamber inside the tank to ensure an adequate supply at the outlet fitting.
Guys that trailer their sleds on a 2 place may never notice the oil bubble problem. I've noticed that as soon as I drop my trailer in the garage, the oil bubble disappears. With the tongue resting on the floor, there's enough of a forward tilt that the oil bubble runs back up to the tank. On the other occasions when I've hauled my sled in the back of my pickup and then dragged it out onto the garage floor, the bubble was always present. That all goes back to the not enough "drop" from the tank fitting to the pump issue.
All that said, I still don't think a small bubble in the line behind the secondary is really a big deal. Like others have mentioned, the pump doesn't flow a full oil line width of oil. As long as there are no bubbles near the pump itself, you should be good to go. Much ado about next to nothing if you ask me. The only reason that Cat will fix it is because they'll get tired of getting questions about it.
The only time I see the potential for a problem is if you were VERY low on oil and were sidehilling to the left, or cornering hard to the left, for a VERY long time.