As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COMPLETE LOSS OF NR 1 HYD SYS. INVESTIGATED FAILURE OF THE NR 1 HYD SYS AND FOUND THE SYS SUPPLY LINE FROM THE NR 1 SYS HYD ACCUMULATOR TO BE DISCONNECTED AT THE ACCUMULATOR AND AT THE OTHER END OF THE LINE. REPLACED LINE WITH NEW LINE. REPLACED NR 1 ENG SYS 1 HYD PUMP AND NR 2 ENG SYS 1 HYD PUMP. FLUSHED ASSOCIATED HYD LINES AND CHANGED ALL SYS 1 HYD FILTERS.