As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG SMELL OF BURNING WIRE IN COCKPIT DURING PREFLIGHT. PERFORMED SMOKE OR FUME IN CABIN INSPECTION IAW FIM 21-00TASK 810. FOUND F/O CONTROL AUDIO PANEL BAD WITH ODOR. R/R PANEL IAW AMM 23-51-11. OPS CHECK GOOD. NO DEFECTS NOTED AT THIS TIME. HAPPENED ON GROUND.