So I pulled my impeller tonight (heading off tomorrow) to sharpen/shim it, and I noticed what looks like heat sign on my shaft. It has some slight blueing on it.
Can't for the life of me recall if it was there before.
The pump was new last year, and I have maybe 40 hours on it. I'm religous on greasing it before/during and after use. No sign of heat on the shim, and the bottom end of the bearing looks fine.
Feel free to chime in.