As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS, LEFT EDP LIGHT AND EICAS ILLUMINATED SEVERAL TIMES. FIRST OCCURRENCE INCLUDED AURAL WARNING AND MAINTENANCE PAGE AUTO RECORDED LEFT SYS PRESSURE OF 470 PSI. REPLACED LEFT ENG DRIVEN HYD PUMP. ALSO REPLACED K131 L PRESS SENSE RLY AND HYD SYS L PRES DLY MOD M921. PERFORMED OPERATIONAL TEST. OPERATED WITHIN NORMAL LIMITS.