MEL
You need to discuss this issue with your Chief Pilot and/or your Chief Engineer. You may well be able to be authorised to operate under the MEL, or alternatively you may be able to be given an authority to operate outside the MEL by being granted a "Dispensation" provided no flight safety issue is involved. In any event, even if the MEL covers the defect it is the PIC who determines whether or not to accept the Deferred Defect.