As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, PILOT REPORTED HEARING A GRINDING NOISE AT VARIOUS PITCHES COMING FROM THE TRANSMISSION AREA. WHEN MAINTENANCE ARRIVED TO INSPECT ACFT THEY FOUND HYDRAULIC FLUID COVERING THE DECK FROM THE HYDRAULIC PUMP AFT AND THE HYDRAULIC FLUID RESERVOIR WAS EMPTY. MAINTENANCE REPLACED THE HYDRAULIC PUMP AS IT SHOWED SIGNS OF HAVING LEAKED ALL HYDRAULIC OIL.