As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CRACK LINE DEVELOPED AT MIXTURE ADJUSTING LEVER ONE INCH BELOW THE THROTTLE SHAFT AND PROPAGATED IN A HORIZONTAL DIRECTION AROUND THE CIRCUMFERENCE OF THE THROTTLE BODY UNIT. ENGINE DEVELOPED AN IDLING PROBLEM AND ON INSPECTION, CRACK FAULT WAS DETECTED. SUBMITTER SUSPECTED THE FAULT CAUSE TO BE CASTING FLAW OR MECHANICAL DAMAGE. CARBURETOR RETURNED TO OVERHAUL FACILITY FOR REPAIR AND DAMAGE INVESTIGATION. (X)