As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AD2000-18-23 WAS C/W BY INSTALLING NEW GASKET PT NR 06B23072 UNDER 34 HOURS, GASKET BLEW OUT AND ALL THE OIL WAS BLOWN OUT. AIRCRAFT RETURNED TO AIRPORT SAFELY. INSPECTION OF GASKET REVELED THAT THE RUBBER GASKET HAD DESOLVED AND BECAME VERY SOFT. A NEW GASKET WAS INSTALLED AS PER INSTRUCTIONS IN THE SB. NO FURTHER PROBLEMS HAVE BEEN ENCOUNTERED WITH THIS AIRCRAFT.