Empty the vaporizer and then run 100% O2 through it to dry the internal wicks thoroughly. Typically takes approx. 45 minutes to run it 1.5 hours to be safe and I would suggest a flow of 3-4 liters per minute.
Then I would fill with sevo and test outputs of the vap with a gas analyzer.
I would also question the tech as to why and how they did this........there are safety measures in place to avoid this from happening. Just my thoughts.