Product review (5 stars): Dryer died, bought parts, fixed.
So the dryer (DLE3777W) stopped working. Push the start button and after a couple seconds it gives up. I try to spin the drum manually and it won't turn. I see that in the rear, the drum is visibly sagging, maybe a quarter inch or so. I found the service manual online and see it has four rollers, so I end up here and order four. Just in case. They arrived promptly, and that is part of the five stars. When the dryer won't work, each day waiting counts.

I made a couple minor mistakes that cost me a few minutes here and there, but the repair was not that bad. Note: keep the screws for each part in a baggie, taped to that part. Most of the screws are the same type, but some are different. Also, it is probably best not to remove the screws for the rear panel. After removing the drum, there is plenty of room to get to the rear rollers. Getting the drum out was a pain because the drive belt was under tension. I suggest undoing the belt from the tensioner beforehand. You can do it, just look at it first (so you can put it back on later) and do it by feel. When you look at the picture in the service manual, you might think that the belt and tensioner must be wrong because the belt will rub against itself. Actually, the tensioner goes far enough that the belt has no problem there. I tried to set the belt right and move it onto the drum as I moved the drum into place, but that didn't work. What did work is to move the drum into place, supported by the rear wheels in the rear and a bungie cord from the front of the drum to a hole in the back. With the drum held in place, I could put the drive belt around the motor and pull the tensioner far enough to get the belt around it too. It was rather tight, and done by feel, but not so bad. When the drive belt breaks, I know what to do.

The plastic triangles were really annoying. I didn't break any, but if I did, I could probably replace them with E-clips from the hardware store. Two of the rollers were slightly worn, but I replaced them anyway. One in the front was frozen on the shaft and had a wear spot. One in the rear was frozen and was devastatingly worn. I cleaned the shafts with solvent and the new rollers rolled well.

The inside was covered everywhere with lint. I am glad it didn't catch fire at some point! Something to think about...