As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT SYS PRESSURE AND RUDDER RATIO EICAS MESSAGE APPEARED AT 14000' ON CLIMBOUT. CAME ON AND WENT OFF THREE DIFFERENT TIMES WITH NO SYS PRESSURE LIGHT ON LT SYS. APPEARED A FOURTH TIME A SHORT TIME LATER FOLLOWED BY SYS PRESSURE LIGHT ON LT SYS. FOUND LT HYD SYS SWITCH S27 DEFECTIVE. REPLACED SWITCH IAW AMM 29 29-11-17-404-27. OK FOR SERVICE.