The terminal is where the cable from the battery attaches to the starter so it will get the power to start the engine. It is a large cable in the engine compartment.
Thank you for your information about starting. As I'm a similar problem, what's exactly the starter "a cracked positive terminal on the starter" ? Is it the green start button or directly other ? Sorry I'm French and I want to report that and discuss monday with the garage (because many times deposits in the garage and no solutions ...)
My best and congratulations to solve your problem.
XLR is a super car but so many little problems due to a bad maintenance ...