As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROLL, FIRST OFFICER COULD NOT HEAR ANYTHING THRU HIS HEADSET. CAPTAIN COULD HEAR HIM TALK, BUT FIRST OFFICER WOULD INTERMITTENTLY LOSE ALL AUDIO. HE SAID IT WAS CONSISTENTLY FADING OUT. TRIED ALL 3 DIFFERENT HEADSETS. R & R FIRST OFFICERS DIGITAL AUDIO PANEL. OPERATIONAL TEST IS GOOD IAW AMM 23-51-01.