As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYD Y SYS LOW PRESSLOW SPEED REJECTEDTAKEOFF AT 30KTS REFER TO L/P 6089998 FOR COMPLETED REPAIRS. HYD Y SYS LOW PRESS FOUND HYD LEAK FROM PARKING BRAKE VALVE FIN 2579GM PACKING REF AIPC 32-45-03-03D ITEM NUMBER 230. REPLACED PACKING AT PARKING BRAKE VALVE REF AMM 32-45-14. OPS CHK GOOD, NO LEAK OBSERVED. REPLENISHED HYD SYSTEMS.