As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTED LEFT HYDRAULIC LINE FROM PILOTS MASTER CYLINDER TO THE BRAKE METERING VALVE. FOUND AREAS OF SUSPECTED PIN HOLD CORROSION IN AREA OF CARGO DOOR. REPLACED 5 FT SECTION OF LINE BY CARGO DOOR IAW ATR42 JIC 20-23-13 BIED LINE IAW ATR42 JIC 32-42-00-BLD 10000. OPS CHECK GOOD IAW ATR42 JIC 32-42-00 OPT 10000. THE AIRCRAFT WAS RETURNED TO SERVICE.