Help wanted?

An email alert from Muni:

HeadsUp: The 38 Geary Route may experience service gaps/extended wait times due to operator availability. Our apologies for any inconvenience.

Rob's comment:

6,387 employees and Muni can't keep enough "operators"---Muni drivers---on the job? Are these the "transit operators" on the top of the list who make $360,911 a year? That's pretty good money even in San Francisco.