As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE INSPECTION THE LT POSITION IGNITER WOULD NOT FIRE. SWAP OF BOX OUTPUT FEEDS TO THE IGNITERS VERIFIED THE BOX CIRCUIT WAS DEFECTIVE. THIS BOX GAVE GOOD SERVICE BUT SEVERAL OTHER HAVE HAD PROBLEMS WITH LOW SERVICE HOURS THESE BOXES ARE NON-REPAIRABLE. (K)