As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAT - EN ROUTE FAT TO SMF, FLIGHT OFFICERS INTERCOM TRANSMISSIONS REPORTED TRANSMITTING ON COMM RADIO FREQUENCY WITH PTT SWITCH SELECTED TO INTERCOM. AIRCRAFT RETURNED TO STATION. AVIONICS REPAIRED SHORTED WIRE AT FLIGHT OFFICERS PTT SWITCH. INTERPHONE SYSTEM OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE. (M)