As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DRAIN VALVE CAME OUT. AIRCRAFT WAS IN-FLIGHT. POWER LOSS WAS NOTED. PILOT LANDED SAFELY, NO DAMAGE TO PERSONS, AIRCCRAFT, OR PROPERTY. SUBMITTER RECOMMENDS CURRENT VALVES BE RE-TORQUED AND TORQUE STRIPE. FUTURE VALVES TO BE DRILLED TO FACILITATE SAFETY WIRE.