As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - WHILE EXTENDING FLAPS TO NR5 POSITION, HYDRAULIC LOW-PRESSURE LIGHTS ILLUMINATED. QUANTITY WENT TO ZERO. LANDED WITHOUT INCIDENT. REMOVED AND REPLACED (A) SYSTEM HYDRAULIC PRESSURE LINE. ACCOMPLISHED CONDITIONAL INSPECTIONS. RETURNED TO SERVICE. (K)