Toilet issues like constant running, weak flushes

https://academy.educause.edu/eportfolios/12410/home/reasons-why-homeowners-trust-plumbers

Commode concerns like continuous operating, weak flushes, or cistern leaks usually originate from worn inlet shutoffs or flappers; in older Geelong homes, out-of-date installations might also conceal sluggish leaks that stain floors and wall surfaces.