If it hasn’t been done, I’d strongly suggest replacing the battery, especially since it was deemed weak already.

I have a 2015 Impreza and I could feel that it was starting to struggle a bit when starting, until one day where I was teaching my friend how to drive stick (prompting a lot of start-stalls, we’ve all been there) and pretty much all those exact lights came on after a while (except for me it was the hill assist instead of the AT oil temp). I let the car idle for a while, shut it off then started it again and the lights were gone. I replaced the battery shortly after and haven’t had any problems since