As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION, NOTICED FUEL LEAKING ON FLOOR. FOUND SUMP DRAIN VALVE LEAKING. REMOVED AND REPLACED O-RING. THIS IS A COMMON PROBLEM. O-RING MATERIAL SEEMS TO HAVE RADIAL CRACKS AND LOOKS TO BE DRY ROTTED. NEEDS FUEL RESISTANCE MATERIAL.