As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLT L HYD QTY EICAS MESSAGE AND L HYD RSVR LIGHT ILLUMINATED. OBSERVED L HYD QTY SLOWLY DECREASE FROM .48 TO .41. TURNED OFF L ENGINE AND L ELEC HYD PUMPS HYD QTY STABILIZED AT .40. T/S FOUND RUDDER HYD TRANSFER VALVE AND LINE LEAKING. REPLACED RUDDER HYD TRANSFER VALVE INSTALLED TEMP LINE.