As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUBMITTER STATES AS A STANDARD PRACTICE AT RUN-UP, TEST IGNITION SWITCHES IN THE 'OFF' AND PAST 'OFF' POSITIONS AS STATED BY TCM AD 76-07-12 REGARDLESS OF WHETHER IT APPLIES OR NOT. THIS SWITCH DID NOT APPLY, YET FAILED THE PAST 'OFF' TEST. IT HAD A 4 NUMBER DATE CODE OF 8148 AND CAME OUT OF A 1980 AIRCRAFT.