As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB #4 ENGINE PROP OIL LOW LIGHT CAME ON. VISUALLY CONFIRMED HYDRAULIC FLUID LEAKING OUT BEHIND PROP & DOWN THE SIDE OF ENGINE COWLING. SHUTDOWN #4 ENGINE IAW AOM AND RETURNED TO PANC. / REMOVED AND REPLACED #4 PROPELLER ASSY IAW HN6101 LP 51209