Did another initial y-arm alignment from scratch.

- TMS pointing to hit the center of ITMY, with the hitting-catch-at-all-four-cardinal-directions technique (Pitch -107.0, Yaw: -25)
- ITMY pointo to the Baffle PD's:
   BPD 1:  Pitch: 197.0, Yaw -157.5
   BPD 4:  Pitch: 230.7, Yaw -191.5
   Center: Pitch: 213.85,Yaw -174.5
- EMTY pointing to center, with the hitting-catch-at-all-four-cardinal-directions technique (Pitch -107.7, Yaw: -34.1)

- This brought back good flashes at the center of the reference camera, without any move of the BS or PR3.