As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TROUBLESHOOTING A FLASHING BEACON PROBLEM, FOUND BEACON WIRED TO AVIONICS SPLIT BUSS AND WOULD NOT WORK UNTIL AVIONICS MASTER WAS TURNED ON (2ND AIRCRAFT IN 1 MONTH). THIS SITUATION COULD BE A PROBLEM IF THE AIRCRAFT WAS IFR AND LOSE THE POWER RELAY OR AVIONICS MASTER SWITCH, ALL POWER TO THE AVIONICS BOSS WOULD BE LOST.