Before going back to production running after the access, I added 'adc18_setpedestal' commands to the appropriate boot scripts.
Now, every time a crate is rebooted, the proper values are called for each 18-bit ADC board and there is no more danger of the pedestal changing in the middle of the day.
A copy of this log entry has been emailed to: rom@jlab.org, paschke@jlab.org, silwal@jlab.org