As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORT: C HYD SYS MAINT MSG. ELECT C1 PUMP PRESSURE IS 2690 PSI, C2 ELECT PUMP PRESSURE IS 2410 AND ADP PRESSURE IS 2990 PSI. REPLACED CENTER HYD PRESS TRANSMITTER, NO HELP. WITH CENTER WING HYD SHUTOFF VALVE OFF, ELEC HYD PRESSURES RETURNED TO ABOVE 2800 PSI. TROUBLESHOT DOWN TO LEFT INBD AIL CENTER ACT, WITH LINE CAPPED. PRESSURE WITHIN LIMITS.