As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT CONTROL SYS MESSAGE ON STATUS FOUND ON ETOPS CHECK. FLT CONTROL SYS MESSAGE APPEARS AND WILL DISAPPEAR BY TURNING ON AND OFF THE HYD SYS LT, CTR & RT. WHEN PRESSURE IS OFF MESSAGE APPEARS. WHEN PRESSURE IS ON MESSAGE GOES AWAY, REPLACED B31208 COUPLER IAW MM, NO HELP. INTERMITTENTLY REPLACED HYD IM CARD. ACCOMPLISHED MAT TEST. ALL CHECKED NORMAL. CYCLED ALL HYD PUMPS SEVERAL TIMES. NO MESSAGE RETURNED WHEN PUMPS TURNED OFF. OPS CHECKED GOOD.