Yesterday, all the ISI and HEPIs were deisolated to check the fluid system Accumulators' gas charge.  All HEPI and ISI DC positions are held by the Isolation loops except for the BSC's ISIs.  I reviewed these platforms' cartesian positions and the ETMYs RX tilt has the largest shift at 3urads, ITMX RX delta is 1.5urads.  Some positions change by a couple ums: ETMY X shifted 2um, ITMX X shifted 1um.  All other shifts are a few hundred nm or nrads or less with most being less than 100nanounits.

I don't think the SEI is contributing to alignment difficulties.