Yes, would love to know how they got wet. I have mine on a large covered porch and cover them when not in use. That being said I live in Georgia where the humidity can get up there.
Does anyone take their pellets out or just leave in.
Try Youtube. I had to replace the fan on my RT-680 a few years back and a part of that job was removing the auger and found several Youtube vids that walked you through the process. As you can imagine there isn't a lot of room to work but it wasn't a horrible job.