Oh please spare me the nauseating refrain "a camera is just a tool"... It's silly, it's far from reality, and most of all it gets inappropriately repeated over and over and over on this forum every day.
A hammer is "a tool". A wrench is "a tool". A camera is a complex mechanism made of thousands of delicate parts, not "a tool". It has a body and it almost has a soul. And as all complex mechanisms it obviously needs great care and periodic cleaning, lubrication and adjusting if one really wants it to "work properly".
If anyone sees little difference between a camera and a hammer, then it's really no surprise if his/her camera are "worse" when they're passed to the next owner.
I humbly suggest everyone to take better care of each own's equipment. Unfortunately these cameras are no longer made: every camera damaged or broken is gone forever.