After Ryan was able to lock PRMI by adjusting both the MICH and PRCL gains (77926) , he mentioned to me that the build ups didn't look good.  Indeed, POP18 was around 26 counts after PRMI ASC ran, before our PR3 moves this week it would be around 50 counts in PRMI.  I looked back and it hasn't been 50 since I put PR3 back on Friday.  I was able to walk PR2, PRM and BS to improve the build up a little, but decided to move PR3.  We did this at LOCKING_ARM_GREEN, and saw that putting PR3 back according to the slider values (rather than top mass osems), did improve the COMM beatnote from around -10 to around 0dBm. 

Ryan is going to run an initial alignment skipping the green arms, and try to relock PRMI.  Then we will see if this PR3 move solves the low POP18 power, if the PRMI gain changes can be reverted. 

Also note that Ryan posted a PRCL UGF measurement that seems very strange.