A government lab has been doing long-term tests of many EV cars including 4 2013 C-max. They log all service and repairs.
Three out of the four have required transmission replacement between 90k and 116k miles, with an average cost of around $4000.
Other service has been negligible in comparison. Here are selected data and link to the page of pdf's.
Long term repair experience with four 2013 C-max.
Advanced Vehicle Testing Activity - Idaho National Laboratory
116k replaced transmission $3989
116k replace right hub bearing $252
127k tires (first replaced 60k) and front-end alignment
130k repair window track
90k replaced transmission $4383
130k replaced 3 tires
73k replaced 12V battery $166
77k replaced 4 tires
77k front end alignment
110k serviced transmission
155k replaced two tires
70k replaced 3 tires
81k replaced 12V battery
100k serviced transmission
110k replaced transmission $3889
130k replaced two tires and aligned front end