6546 Q-TOF does not pump down

Hi. Happy new year. 

I am trying to pump down 6546 Q-TOF after a nitrogen generator was serviced. Unfortunately,  after several days, Turbo1 and Turbo2 are not pumping down although these pumps look working. Rough vac is also higher than usual (previously around 1.7 - 1.8, but now ~ 1.95). I am not sure what is the problem and how to address it. Would you help me? Thank you.

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