What was found
HF 1 RADIO RECEPTION PROBLEM AT ALL STATIONS UNABLE TO HEAR ARINC. COULD NOT DUPLICATE ON GROUND, SWAPPED F/O`S AND OB`S RADIO CONTROL PANELS FOR T/S-OPS GOOD ON GROUND, FO`S RCP NOW (PN 5145-1-64, SN 10850) (OB`S PN 5145-1-64, SN 9782). (K)