Looking to buy a used volt, have one question.

Hi /r/volt,

I'm looking at buying a 2013 volt in the near future. It has just under 7000 miles. My one concern, assuming that everything looks kosher when i test drive, is the carfax says that it had the "inverter serviced" at about 5000 miles. My guess is that the inverter just failed and was replaced under warranty, but do you think this is a reason for concern? Thanks!