The temperature sensor interface box (D980400, S/N BL3001, S1400577) was installed on the PSL table.  All the temperature sensors were plugged in.  The ambient temperature sensor was taped to the side of the PSL table.

The DB25 cable for the interface box was pulled from the outside.  This cable has a gender changer on it temporarily as a DB25 male to DB25 male cable was not available.

Whilst there I tweaked the alignment into the reference cavity.  Transmission improved from ~1.1V to ~1.8V.  We should look at this when there is a period of time greater than the 4 hour maintenance interval.

Also whilst in the enclosure, all of a sudden the air conditioning and the HEPA fans switched off.  The AC control units inside the enclosure were off, ie nothing on the LCD display was displayed.  The control unit outside had a message "TEMP SWITCH OFF" and was indicating that the fans were still running even though they were not.  I tried restarting the fans, using the procedure near the display unit, and nothing happened even though it indicated the various fans were running.  After waiting about 5 minutes, I tried restarting the fans again.  This time it worked.  The AC control units now indicated:
  CHECK        E4                01
    00         ERROR CODE        10
I cycled the AC using the control unit, everything seemed fine afterwards.