Yes, isn't that Murphy's Law thing annoying!!!
Maybe try soaking the pump part in some vinegar water and after a while add some baking soda and scrub and shake it a little in the water, then I'd rinse it again and try some vinegar & fresh water just in case it starts up. Otherwise I guess it would be done for. It is amazing about the pink slime stuff that can gunk those little pumps up inside. They are similar to the little pumps in table top water fountains.
Maybe try soaking the pump part in some vinegar water and after a while add some baking soda and scrub and shake it a little in the water, then I'd rinse it again and try some vinegar & fresh water just in case it starts up. Otherwise I guess it would be done for. It is amazing about the pink slime stuff that can gunk those little pumps up inside. They are similar to the little pumps in table top water fountains.