Swollen Battery / Unresponsive Trackpad Click
My Mid-2015 MacBook Pro Retina 15" was feeling weird (unlevelled) on the desk and seemed to be running very hot. Also, the case at the lower front edge appeared to be bulging. I opened it and was very surprised to see the original battery was almost double the expected size. Being an older machine and later on Saturday afternoon, I replaced the battery myself (purchased a new one and some tools from a local parts seller) so I could continue to work without fear of my laptop spontaneously combusting. BTW, the battery was hissing when I removed it!
Anyway, after battery replacement and conditioning everything was fine...except the trackpad 'click' has stopped working. Not a showstopper but definitely an annoying result. Anybody have a fix for this? I've tried all the regular recommendations like NVRAM, PRAM, SMC reset kind of things without any positive result. What are my options at this stage?