As far as i believe, the B2's will be carrying out decontam, delivery/collection and assisting the B5 tech, maybe EST.
The current B5 MEL staff are not qualified techs which is why they would be replaced with 2's if they left.
Our library, which opened in 1998, has always been just that, the staff book general ward devices in/out, deliver and collect from wards, clean the equipment and c/o very basic maintenance i.e. changing plug fuses, EST, changing batteries etc. The PPM and repairs are traditionally the responsibility of our General EBME Section although i (ITU Tech) do their syringe drivers.
Topper