Thanks for the replies and for the information.
We are only in town here for a week or so, so if we decide it needs replacing will probably replace the entire thing.
The entire house is in serious need to updating however we need to spend more time cleaning it out of furniture, etc.. to prepare for sale.
We are only fixing the shower walls because they leak into the basement. Plastic tiles attached to drywall. Wow.
Toilet leaks when flushed and probably only needs new wax ring, but it is also very old. I'm afraid once removed it won't be possible to replace. Has two bolts on each side. So we are just going to put in a new toilet.