A few things:
Make sure the fork/front F key isn't holdind the palm F key open, I've seen this a few times.
Make sure the G# articulation screw isn't over adjusted, that is the screw that closes the G# when any of the right hand keys (F - D) are pushed down. If this screw is over adjusted it will keep the F# key (key between F and G#) from closing completely. Likewise, if you are having issues with low C# through low Bb, this screw may be under adjusted and not closing the G# completely.
If you have a good eye you can spot some regualtio issues without a leak light. Find a key that pushes down another at the same time, F for example, and push it down. Do the two pads hit the toneholes at exactly the same time, or does one hit before the other? Ok ok, you need a leak light to tell exactly, but you can eyeball it and get a general sence of the shape of the adjustments.
The pads are a completely different thing, however. What shape are they in? What color? Are they soft to the touch? Soft, orange pads can be tweaked really well, but older/darker/dried out pads and be more of a pain.
Is the neck sealing properly? A good sign that it is (though no guarentee that it is) is that once the screw is tightened the neck doesn't move.
These are all things that should be taken under consideration...
Good luck!
-Scott