As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED RECEIVING "HYD QTY EICAS MESSAGE PRIOR TO DEP L HYD QTY DROPPED TO 0.26, RT HYD PRESS DROPPED TO 2940 PSI." CREW DIVERTED TO PHX AND LANDED WITHOUT FURTHER EVENT. MAINTENANCE FOUND METAL IN LT CASE DRAIN PRESSURE MODULE FILTER. ALSO, FOUND THE LT FILTER MODULE BYPASS INDICATOR LEAKING. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENG EDP AND THE DIFF PRESS INDICATOR ON THE LT FILTER MODULE. LEAK CHECKS WERE GOOD.