As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PASSENGER BOARDING THE CREW REPORTED A STONG SMELL OF FUMES AND NOTICED A LARGE POOL OF HYDRUALIC FLUID BELOW THE MAIN LANDING GEAR DOORS. THE PASSENGERS WERE DEPLANED NORMALLY. THE LEAK WAS FOUND TO BE AN O-RING ON THE MAIN LANDING GEAR RETRACT ACTUATOR WHICH WAS REPLACED. A SATISFACTORY OPERATIONAL CHECK WAS PERFORMED AND AIRCRAFT WAS RELEASED FOR SERVICE.