Contract service provider-Services

Dear All,
I had one more query, suppose our Kaye validator is not working in this case,can we conduct SIP revalidation mapping by the outside service agent or provider?

What are the documents we should to ask with them? For Ex. Accredition- National certification, calibration certificate of instruments/their Kaye validator…?and what else needed…
It’s really need to make / fill contract services aggrement and questionnaire?as I am doing this 1st and last time…!! this service…

Thanks