As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOST THE LEFT HYD ALMOST COMPLETELY DURING DESCENT TO LHBP (BUDAPEST, LISZT FERENC NATIONAL AIRPORT HUNGARY). THE A/C LANDED AND STOPPED SAFELY ON RNWY 13R. A/C TOWED TO STAND T/S STARTED TO INVESTIGATE THE CAUSE OF HYD LOSS L/H HYD SYS. LINE MTC TROUBLE SHOOTING FIND THE PRESSURE MODULE UNION O RING GOT LOSS ITS SHAPE. REPLACED THE O-RING