As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNIT REQUIRED BY AD 97-20-04 FAILED AFTER 50 HOURS. EIGHTY PERCENT OF THE UNITS FAIL TEST. SUBMITTER STATED THEY SHOULD BE RETIRED FORM SERVICE AS UNRELIABLE. USED ON MOST OLD PIPERS, ENSTROM, AND MANY OTHER AIRCAFT. AT LEAST ONE ACCIDENT WAS CAUSED BY THIS PART FAILURE.