As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND LEFT HYDRAULIC SYSTEM PRESSURE LIGHT AND ASSOCIATED EICAS "L HYD SYS PR" MESSAGE INOP. FOUND ELEC HYD PUMP L CTL S27 PRESSURE SWITCH OPEN. VERIFIED THIS IS ALSO THE PROBLEM WITH RUDDER RATIO. SWITCH NIS DEN PCN (481-0076). REPLACED S27 REF IPC 29-11-17, LEAK AND OPS CHECK OKAY.