You run the daily quality control on the TSH on the TOSOH an…

You run the daily quality control on the TSH on the TOSOH and see that Level 1 and Level 2 are in, but Level 3 is >-4 S.D.  This is a 14S  error. What should you do after re-running Level 3 and it is still out?  You could calibrate the assay, or you could do what else first?