As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYD A SYSTEM ENG 1 LOW PRESSURE LIGHT ILLUMINATED. GROUNDED - YES. AIR TURNBACK - DIVERSION 61 MINUTES. FOUND SIGNIFICANT LEAK FROM NR 1 ENG HYDRAULIC A SYS. OPENED COWLING AND LEAK WAS FROM EDP CASE DRAIN, BLEED RESERVOIR PRESSURE TO STOP RESIDUAL LEAKAGE. REMOVED AND REPLACED NR 1 ENGINE EDP, LEAK AND OPS CHECK GOOD REF AMM 29-11-11.