Patio gliding door roller replacement

I have a standard vinyl Andersen sliding patio door in my house ( I believe its called Perma Shield) about 20-25 years old. I have removed the rollers from the bottom and cleaned them, but the door still seems it takes a lot of effort to open and close. While I had the rollers out I noticed the wheels seemed to be turning freely, but I guess with the weight on them its a different story. The track is clean and I sprayed silicone where the door rubs against the upper track. But still it does not open easily. I have another identical sliding door in my den and that seems to open fine. Should I assume the bearings in the rollers are bad and just buy new rollers? Or is there something else I should look for?
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one or more of the rollers may indeed be worn out, however there is typically an adjustment for each rollers height & alignment as well, so I would check that first
I have installed so many brands that I cannot remember off the top of my head whether the Andersen's have the adjustment screws or not, and I don't have an Andersen close by to check.

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Yes I have adjusted them to no avail. They have hole plugs in the doors that when you remove them , you stick an allen key to adjust the height. But no matter how I adfjusted them, they don't get better.
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I, too, tried to rejuvenate the old rollers in my patio doors by cleaning and oiling them. Did not work well, although was an improvement. After I put in new rollers, they slide like greased lightning. Costs about $ 15 per door. The rollers usually just slip in the frame.
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Walter
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Thanks Walter. Andersen has a pretty good website. It has parts for doors dating back to more than 30 years ago. A local Andersen dealer has the rollers for $10 each. And they too just slip into the frame . I pick them up later today so I'll keep you posted.
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