As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED A HYDRAULIC NR 1 LOW PRESSURE CAUTION MESSAGE CLIMBING THROUGH 14,000 FT. TURNED ON HYDRAULIC 1B AS PER QRH, HYDRAULIC PRESSURE STILL SHOWED ZERO. RETURNED TO PHX. REMOVED AND REPLACED LT ENGINE HYDRAULIC PUMP IAW MM 29-11-01 AND LT HYD PUMP CASE DRAIN LINE. OPERATIONAL CHECKS AND LEAK CHECKS GOOD. NO DEFECTS OR LEAKS NOTED AT THIS TIME. S/N OFF: MX661187.