[Koji, Steve, Jamie, Yuta]
So, PRM was NOT flipped......
We opened the BS chamber and quickly checked the arrow on the PRM pointing HR. It turned out to be correct, the arrow was pointing towards the arm cavity. We opened the ITMX chamber, too, to check PR2 later.
BS chamber and ITMX chamber is now closed with the light door.
But it was a one step forward anyway, because we could prove PRM was innocent.
What to do next:
We know that the mode-matching of the incident beam and both arms are pretty good. So, dirty modes come from PRC.
We will check beam clipping, mirrors, suspensions in PRC.
I expect the chambers to be closed on Monday(July 2) afternoon and start pumping on Tuesday(July 3) morning.