There are little spot in the middle of long fiber N7 & N9. Try to clean during fiber change: No effect. As a result, N7 & N9 upstair connector temperature is high (hand feeling 80C for N7; 70C for N9).
When N8 was taken out from the fiber box, there is no protective cover on it. But amazingly, there is no spot on N8 tips. And the hand feeling connector temperature is only ~50C.
I tried to improve air cooling on those connectors in laser room.
A copy of this log entry has been emailed to: yqiang