As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT ALT 230 CLEAN CONFIG LEFT HYD SYSTEM PRESSURE WENT TO ZERO. RAN CHECKLIST AND PER PROCEDURES REGAINED LEFT SYS PRESSURE AFTER TURNING ON AUX AND TRANS PUMPS. REPLACED LT ENGINE HYD PUMP, CASE DRAIN AND IN LINE PRESS FILTERS. RAN ENGINE CKS OK. LEAK CK OK.