As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A ATB - LEFT HYD SYS PRESS LIGHT ILLUMINATED WITH EICAS MSG & RUDDER RATIO EICAS. HYD QTY DECREASING APPROX 1 PER 6 MINUTES. REMOVED AND REPLACED HYD PRESS SWITCH (S27). OPS TEST & LEAK CHECK DONE. SATISFACTORY & NO LEAK IAW MM 29-11-17-4/29-31-01-4. P/N ON 211C223-528, S/N ON A02019A.