As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) ROCKER SHAFT RETAINING LUG BROKE OFF THE ROCKER HAT ALLOWING THE INLET VALVE ROCKER SHAFT TO MIGRATE AND THE ROCKER TO DISLODGE. THE LUG IS NORMALLY SILVER SOLDERED TO THE ROCKER HAT. SUBMITTER SUSPECTED CAUSE AS POORLY SOLDERED JOINT.