With the concern expressed by the AOS/SLC/ACB crew, I thought it reasonable to look at the level of the Solid Stack Panel(SSP) to which the ACB is bolted.  The components of the ACB cover most of the panel but there is a few inches available at the East end and just a couple at the West end.  The SSP is ~10" wide (N-S) and 30" long (E-W).  Our 'as-built' measurements using the Sokkia Optical Auto Level put the SW corner of the SSP 0.9mm lower than the opposite NE corner.  The other corners, NW & SE, were within .2mm of each other:
Start level wrt average:
NW  0.0mm
SW  -.5
SE  +.2
NE  +.4

0.9mm/30"(762mm)==1.2mrad.  For some reason out on the floor I calculated about 3x this...not sure what I did.  Anywho...Lisa said the requirement was 0.14degrees or 2.44mrad so we were already there.  Still given my miscalculation earlier we made it even better.  We loosened the bolts holding the SW corner of the SSP to the I-Beam on which it sits.  This allowed that corner to lift up.  I then slipped a pseudo ClassB 20mil shim between the SSP and the I-Beam and re-tightened the bolt.  Despite the 20mils, this only improved things a little with other things playing into the game.  The West side to East side tilt only improved to 0.7mm but that is of course well within the 0.14degree spec.

Final level wrt average:
NW  -.3mm
SW  -.3
SE  +.4
NE  +.3