As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYD NR 1 ANNUNCIATOR ILLUMINATED AFTER TAKEOFF. HYDRAULIC PRESSURE WAS LOST ON SYSTEM 1. QUANTITY WAS SUFFICIENT AND STANDBY SYSTEM WORKED NORMALLY. HYD NR 1 SYSTEM PRESSURE PUMP HAS BEEN REPLACED, P/N 40053-03, S/NOFF AH-16041A, S/NON AH-16086A. FILTER INSPECTED AND GROUND TEST CARRIED OUT OK.