As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INVESTIGATION FOR DETERIORATED LT MAG FOUND LEFT MAG WAS (PRESSURIZED) FROM SAME 'T' FITTING AS RIGHT MAG BUT HAS MORE HEAT. LEFT MAG HAS B AND D TACHOMETER PICK UP WITH LARGER ORIFICE WHICH ALLOWS ALMOST TWICE THE AIRFLOW ALLOWING MORE HEAT INTO MAG. SUBMITTER STATED SLICK REPORTED OVER 1 YR AGO THEY WERE AWARE OF PROBLEM AND IT WOULD BE CORRECTED. THIS IS THE 2ND TIME HAVE HAD THIS PROBLEM WHICH IS SHARED BY MANY MOONEY OWNERS.