As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
POP - LOST YELLOW SYSTEM HYD PRESSURE ON APPROACH. FOUND YELLOW HYDRAULIC FILTER O-RING MISALIGNED CAUSING HYD LEAK. REMOVED AND REPLACED O-RING FOR YELLOW HYDRAULIC SYSTEM FILTER. RAN ENGINE FOR 2 MINUTES AND VERIFIED NO LEAKS AT FILTER. AIRCRAFT OK FOR CONTINUED SERVICE. (M)