i guess so. Any deviation from what the manufacturer designed the car to do is therefore covered by warranty *with exceptions that i won't cover* however if you have a leaky washer hose then by all means get it checked out. Sounds like it's a case of once pissed on, twice checked, third time fixed. Doesn't sound serious unless it keeps happening.
2002 Machine Silver Zetec 2.0L, Manual 3 door, ST170 Suspension, 17" ST170 Wheels, ST170 front grille, ST170 interior handles, Genuine Ford Alloy & Leather Gearknob & Handbrake, ST170 clear side indicators, Electric Blue Zetec floor mats