As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
C-HYD QTY EICAS, LEAK COMING FROM DUAL PRESS/CASE DRAIN MODULE-C LOCATED IN HYD SERVICING BAY. LEAKING COMING FROM UPPER SWITCH BASE ASSY SEE PIC. PULLED AND COLLARED BOTH CENTER HYD PUMP CBS. REMOVED AND REPLACED O-RING ON UPPER PRESSURE SWITCH OF FILTER MODULE AND CASE DRAIN FOR CENTER ACMP IAW AMM 29-11-19-404-035. NO LEAKS NOTED. C PRESSURE REMAINS STEADY. C-HYD SERVICED BACK TO ALLOWABLE LIMITS.