As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUPLICATED A REPORTED FAILURE AND ISOLATED CIRCUIT BREAKERS ON NR 1 BUSS TO SHOW THAT THEY WERE FAULTY. INSTALLED 2 EACH NEW 50 AMP BREAKERS. FUNCTION CHECKED SATISFACTORY ON GROUND AND THEN PERFORMED MAINTENANCE FLIGHT CHECK. SUBMITTER STATED THE BREAKERS SEEMED TO BE ORIGINAL EQUIPMENT.