As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYDRAULIC QTY DECREASED TO ZERO AND SYSTEM PRESSURE LIGHT ILLUMINATED. EICAS MESSAGE "L1 HYD SYS PRESS" DISPLAYED. NOTE: PER PILOT EVENT REPORT "DECLARED EMERGENCY". FOUND LT EDP CASE CRACKED AND METAL IN CASE DRAIN AND PRESS FILTER IN MODULE. FLUSHED PUMP PRESS LINES AND CHECKED LT AC PUMP AND MAIN RETURN FILTERS NO CONTAMINATION FOUND. REMOVED AND REPLACED LT EDP IAW 29-11-05-4. OPS CK OK.