What was found
FAT - EN ROUTE FAT TO SFO, FLIGHT OFFICERS INTERCOM TRANSMISSIONS REPORTED INTERMITTENTLY TRANSMITTING ON COMM RADIO FREQUENCY WITH PTT SWITCH SELECTED TO INTERCOM. AIRCRAFT RETURNED TO STATION. AVIONICS REPLACED FLIGHT OFFICERS SWITCH AND FLIGHT OFFICERS CONTROLLER (STATION BOX). FLIGHT OFFICERS COMMUNICATION SYSTEM OPERATIONAL CHECKS NORMAL. AIRCRAFT RETURNED TO SERVICE. (M)