It rather depends what "it" (as in "do it") is.
Anyway, I'm not going to argue ... if I was the "service engineer" I would assess the situation (and then act accordingly) when I arrived at site - especially if I had been "called in" by the hospital (rather than just a routine PM-type visit).
Are you writing policy, or advising others? You need to remember Health and Safety at Work, Risk Assessment, Duty of Care ... and so forth.