I'm not experienced on Toshiba anymore but when I was working on them we used as rule of thumb to replace whole developer unit after 3-4 developers,...
Never installed KM 5020i but brand new Brother originals don't ask for Time zone for sure, time is set via Initial Setup. Should Factory reset don't...
I think nothing dramatic in short term. After fiasco with toner shortage/outage KM is shaken and forced to release a "new" 1i models. The future will...