These are the serial numbers for the in-service chillers:
P325-18636-1 S/N 44801 (crystal chiller)
P625-18637   S/N 44807 (diode chiller)

The old chillers had serial numbers:
P325-18636-1 S/N 44800
P625-18637   S/N 44806

When pulled from service the chillers had accumulated 30716 hours and
30790 hours respectively.  To my knowledge this cannot (as yet) be reset
from within TwinCAT, so the "new" chillers will have an artificially high
number of hours displayed.  To find the real number of operating hours,
one needs to interrogate the chiller control panel.

All 4 chillers have a date of manufacture of 07/2011.