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 PTT SWTICH AND FLIGHT OFFICERS CONTROLLER (STATION BOX). FLIGHT OFFICERS COMMUNICATIONS SYSTEM OPERATIONAL CHECKED NORMAL. AIRCRAFT RETURNED TO SERVICE. (M)