As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG 1 HYD A SYSTEM LOW PRESSURE PER CREW: ABOUT A HOUR TO FLIGHT THE OVER HEAD PRESS ON ENGINE 1 LOW HYD PRESSURE LIGHT. CREW NOTICED HYD ON LEFT QTY WENT UP TO 106 % AND STEADLY WENT DOWN TO 10% AT LANDING. READS NOW AT GATE 19 RF, CREW REMEMBERS AT DEPARTURE LEFT WAS AT 97%. REMOVED AND REPLACED #1 ENG IAW W.C. 41-7100-1-0006 OPS AND LEAK CKS GOOD.