As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXTERNAL POWER RECEPTACLE HAD SPARKS WHEN EXTERNAL POWER CORD FROM JETWAY HOOKED UP. INSPECTED EXTERNAL POWER PANEL INSIDE, NO DAMAGE NOTED. NO ARCING. AIRCRAFT OK FOR SERVICE. CONFIRMED WILL NEED RECEPTACLE REPLACEMENT DUE TO ERODED PINS AND DAMAGED BASE INSULATION BETWEEN PINS "A" AND "B". WILL ALSO REQUIRE BMS 5-95 SEALANT DURING REPLACEMENT PER AMM 24-41-02.