Sticking Atwood landing gear

I have about an eleven year old Atwood dual motor heavy duty set of landing gear. My drivers side has become increasingly loud with a scraping noise, but only while under a load close to the beginning of when it starts to lift the fifth wheel. I've tried lubing what I could reach but it doesn't seem to help much. Then five days ago at the end of a long trip, the same side gained a new problem that I believe is related. The innermost tube, which has all the holes so you can drop it close to the ground before powering the legs down, started sticking when you tried to put it all the way up in the travel position. This happened fairly suddenly. One day I slid it back up after rehooking to my truck and right at the end of sliding it up it had resistance but went up. Then when I needed to put it down, instead of dropping freely as it usually does, I had to knock it lose. Then next time I put it up I could not even get it up to the last hole. The next time I couldn't get it up to even the second hole. Something is causing a bind up in the top of the tubes. How do I trouble shoot it? I'm back home now. That landing gear is hard to get to from the inside because of an Onan generator over on that side. I'm hoping there's someway to get to the top inside from the bottom of the tubes. My passenger gear works great and both motor gearboxes sound the same when not under a load and when the first few six to ten inches of pushing the landing gear down have passed. So it does not seem to be a problem with the motor and hear box but the tubes. That's my take.