As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
P300 BACK PLANE AUXILARY POWER BREAKER (APB L9-C24335) HAS INSULATOR MATERIAL MISSING, ALSO C PHASE (BLUE) POWER FEEDER WIRE WAS DISCOLORED. RESISTANCE READING AT L9 C24335 C2 EXCEEDED LIMITS. SUSPECT SHORT AT POWER PANEL P300. REPLACED P300 AUX PANEL AND PERFORMED CHECK'S IAW MM'S 24-09-01, 24-22-03, 24-22-05, & 24- 41-01. NO DEFECTS NOTED. ACFTOK FOR SERVICE.