As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A C HYD SYS PRESS EICAS MESSAGE IN FLIGHT. SYS PRESS LIGHT ON OVERHEAD P PANEL ILLUMINATED. PERFORMED TEST OF CENTER HYD SYS IAW B-757 FIM 29-11-00. OPS CHECK NORMAL. COULD NOT DUPLICATE FAILURE. CTR SYS CASE DRAIN MODULE SYS PRESS SWITCH REMOVED AND REPLACED ON L/P 875624 ITEM 3.