As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL TANK CAPS ARE VERY DIFFICULT TO SECURE PROPERLY. IT IS EASY TO PUT THE CAP ON PARTIALLY. THE FACTORY RECOMMENDS THE CAP GASKETS BE LUBED WITH SILICONE SPRAY. WE ARE ALSO PUTTING ALIGNMENT MARKS ON THE CAP AND WING FOR POSITIVE ENGAGEMENT INDICATION.