What had to be done, and would you like to explain the control electronics in the tube?
Is the small light bulb part of a lighting system?
The small light bulb is the modeling light.
As written before the dusty lenses and the oily aperture had to be cleaned.
This MEDICAL lenses have a aperture that is mechanical coupled with the magnification rate and the focus distance - the smalles magnification rate works only with f/4 at a focussing distance of about 1.5 meters, and the biggest magnification rate is at f/32 at a focussing distance of some 20 centimeters.
The MEDICAL controls the flash power via a photocell located in the bayonet that measures the light reflected from the film surface.