Looks like my 2012 rMBP's trackpad is going south, good news (or bad?) is that I made a genius appointment for this evening (over a week ago), to have the MBP's battery replaced. With any luck the top case will be replaced. I was planning on getting a new MBP this summer, when the 2018 models are released, but the plan was that I'd still have the 2012 for use for my kids. Now that's all up in the air.