>>> It is easier to pull one from the closest receptacle, or whatever, than to pull a new wire all the way back to the panel in a finished place.
1. You could pull both hot and neutral from the receptacle and connect that to the portion of the circuit in question after making sure both the original hot and its accompanying inoperative neutral have been disconnected.
2. You might double check all the receptacles etc. on the original daisy chain feed to see if you can find the problem with the neutral. Notably convert push-in-and-stick connections (backstab connections) to screwed on connections.
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.