Dishwasher runs (washes) fine but will not dry.

Timer continues to end of cycle but I do not hear dryer fan running and if open door it is not warm inside--so drying is not operating.

Update-- I have now found that the dryer fan housing is hot (very) but I THINK that dryer fan is not turning. (Can't really see in there--but pretty darn sure.)

This is about 25 yrs old Kitchenaid dishwasher with mechanical controls---pushbuttons and timer knob you can turn.

This happened right after repairman visited and replaced seals at bottom. (He did stop the leak to bsmt.) So I wondered if he left something disconnected.

Thanks for your help.