As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF A-SYSTEM PRESSURE DROPPED TO 800 PSI AND QUANTITY TO 2.8 GAL. NO A-PUMP LOW PRESSURE LIGHTS OR FLIGHT CONTROL LIGHTS. ON APPROACH WHEN FLAPS EXTENDED TO 5, PRESSURE RETURNED TO 3000. *S/D* REPLACED A-SYSTEM PRESSURE TRANSMITTER, A-SYSTEM PRESSURE INDICATOR AND HYDRAULIC QUANTITY INDICATOR.