Did you ever figure this out or find a fix? I'm having exactly this same problem. The netflow logger SHOULD be sending template 267 flows, but sends NOTHING...

Were you ever able to find something on this? I used to to use flowd to generic flowd collection, but for it doesnt' appear that flowd will parse and log CGNAT ...

Did you ever figure this out?  Do your PPPoE sessions successfully load balance over port-channels, at least using src-dst-mac ???  Or does "flow" just work ? 

Did you ever find a resolution to this. We had the same issue, 9001, replaced the fan tray, still get these warnings. Though my temps and fan speeds are much lower than yours. Router seems fine, no LEDs..... just these annoying messages in the logs.