As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSTRUMENT POST LIGHT TRANSISTOR AND RHEOSTAT FAILED BY BURNING UP. SUBMITTER FOUND IF A CAPACITOR/RESISTOR IS INSTALLED IN LINE TO SUPPRESS INITIAL POWER SPIKE, LIFE OF TRANSISTOR AND RHEOSTAT IS LENGTHENED AND CONTROL IS BETTER. FIELD APPROVAL IS PENDING.