Hopefully the people who actually did the work will fill in the details, but here's my brief summary of HAM6.

Horizontal 2" shift is also here at LHO, in the same direction.

Koji and his crews found that the beam was about 2" off horizontally at OM1 toward OMC. This is the same direction and the same amount as what LLO saw. Koji had to move OM1 by about 2" to the South.

They also confirmed that, horizontally, the beam position at the edge of the ISI table is about right, and the beam angle relative to the screw hole rows is much smaller than it should be (the beam is almost parallel to the screw hole rows). 

The beam is too low on OM1.

In addition to horizontal problem, the beam is also too low on OM1 when Koji set the beam at the middle point in the OFI by scanning SR2. 

(I thought Koji said that it was an inch too low on OM1, but it cannot be as OM1 is a 2" optic. Maybe 1cm?)

Koji pointed the two steering mirrors behind OM1 to make the AS beam height right. He also needs to point OM1 up and OM2 down to make the OMC path right.

There are some speculations about why (horizontally and vertically) but we need to check the numbers first. Anyway, this should not stop us from aligning the OMC path for now.