As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IT WAS DISCOVERED THAT THE HALF BANK SWITCH AND THE AUTOPILOT TEST SWITCH HAVE BEEN INSTALLED INCORRECTLY SO THAT WHEN DEPRESSING EITHER SWITCH THE OTHER FUNCTION WAS PERFORMED. THE PANEL CONTROL UNIT THAT THESE ARE IN HAD JUST BEEN REPLACED AND A 8130 ISSUED BY MFG PN U1452