As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT RETURNED TO BLOCKS WITH C1 ELECTRIC HYDRAULIC PUMP INOPERATIVE. NO HYD PRESSURE ON EICAS PAGE. FOUND PUMP TO OPERATE NORMAL FOR ABOUT 10 MINUTES AND THEN SHUTOFF UNCOMMANDED WITH NO UNUSUAL MESSAGES. REPLACED ELCU PER MM 29-11-14. RAN PUMP FOR 30 MINUTES LOADING PUMP WITH FLT CONTROLS AND OPERATION WAS NORMAL.