I seldom require servicing to my gear but when I do I send it to Legend through ECS at Drummoyne. However, I learned yesterday that the guy at Legend is currently on leave O/S for about 6 weeks.
As for opening up a shutter and working on the slow speed race, I am too cautious when it comes to such matters. I have always operated by mutual agreement that repair technicians don't take pictures, and I don't get too far into mechanical repairs.
"Photography was not a bastard left by science on the doorstep of art, but a legitimate child of the Western pictorial tradition." —Robert Galassi