PinMonkeys?!? - The term was originally associated to the pin setters in bowling alleys prior to their automation.
Pinball Repairmen were mechanics, not technicians or engineers (Save those labels for the video game crowd) so at some point, "Mechanics" must have slurred into "Monkeys" and a new job title was born. PinMonkeys!
There's a finite and dwindling number of us out there. If you happen to be one, become a mentor and pass on your skills.