As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE YELLOW HYDRAULIC TRANSMITTER READING LOW ON ARRIVAL. DURING SERVICING OF THE YELLOW HYDRAULIC SYSTEM, FLUID EMERGED FROM THE AIR DEPRESSURIZATION RELIEF VALVE. THE ERRONEOUS READING (FROM THE DEFECTIVE 'HYDRAULIC TRANSMITTER,CAUSED MTCE TO OVERFILL THE HYDRAULIC SYSTEM AND ENDED UP PUMPING HYDRAULIC FLUID IN THE AIR PRESSURIZATION SYSTEM. THE YELLOW SYSTEM HYDRAULIC RESERVOIR 'TRANSMITTER' WAS REPLACED IAW AMM 29-31-11.