As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)ON APPROACH, ENGINE POWER DROPPED 60 PERCENT. POWER LEVER RESPONSE WAS POOR. SUBSEQUENT INVESTIGATION FOUND THAT THE LEFT HAND FUEL CONTROL "ROLLING DIAPHRAGM" HAD AN EXCESSIVE LEAK RATE AND WAS REPLA CED. ON CAREFUL EXAMINATION, THE "ROLLING DIAPHRAGM" WAS FOUND TO HAVE A HOLE WORN THROUGH.