As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT FOR FLIGHT 4553 PIT-FWA, EXPERIENCED LEFT AVIONICS BUS FAILURE. RESET, CAME ON THEN BACK OFF WHEN TRANSMITTING. PIT MAINTENANCE FOUND A LOOSE WIRE ON AVIONICS BUS TERMINAL SWITCH AND TIGHTENED THE TERMINAL. OPS CHECK GOOD IAW SAAB 340 AMM 24-00-00. THE FLIGHT WAS THEN MADE WITHOUT EVENT.