As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 7669 ENROUTE, LIGHT SMOKE COMING OUT OF #2 COMM. #2 COMM SWITCH WAS TURNED OFF & CONTINUED FLIGHT. CORRECTIVE ACTION: MAINTENANCE PERFORMED DETAILED VISUAL INSPECTION OF G430 AVIONICS RACK INCLUDING TRANSPONDERS, DME & ALL ASSOCIATED WIRING. FOUND SINGED MASKING TAPE BETWEEN #1 & #2 TRANSPONDERS. REMOVED TAPE. ALL OPS CHECKS GOOD WITH NO SMOKE PRESENT.