We are all under Support Services here i.e. Estates and Facilities. However there are several sections under this heading which includes us as we come under Estates.
So although we look after gas and electronics from regulators to sophisticated monitors, no electrician, fitter etc here, would contemplate attemping to fix anything of ours - not even in the middle of the night.
They may be good at what they do, but medical devices are entirely different. There have been several documents over the years, highlighting the responsibility of the Supervisor of Technical Servicing (HEI98 and MDA DB9801 for example.) This person is supposed to authorise people to work on equipment, possible with company contractors who report to him when on site, but impossible with tradesmen, unless he has direct control over them.