As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COMM RADIO FAILURE IN FLIGHT OCCURED 5 MIN AFTER T/O. RADIOS RESTORED AFTER APU STARTED AND TRANSFERED NR 2 BUS TO APU. RAN ENGS ALL COMRADIOS CK GOOD. INSPECTED STATIC WICKS AND ANTS. ALL OK. REPLACED AUDIO ACC UNIT. ALL RADIO FUNCTIONS NORMAL.