As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL200 HEARD NOISE FROM AVIONICS RACK, 30 SECONDS LATER SMOKE AND STRONG ELECTRICAL SMELL IN COCKPIT. NOTHING NOTED IN CABIN. OPENED AND INSPECTED ALL FWD AVIONICS COMPARTMENTS FOR EVIDENCE OF ELECTRICAL ARCING BURNT. SMELL AND OR C/B POPPING AND UNABLE TO FIND ANY. RUN AIRCRAFT AVIONIC SYSTEMS POWER, NO DEFECTS NOTED. ORIGINAL SUBMISSION DATE: 8/29/2023