As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PULSATING SOUND COMING FROM AURAL WARNING SPEAKERS. SOUND GONE WITH WARN ELEX A (P5 J33) AND WARN ELEX B (P5 B18) BREAKERS PULLED. REPLACED EGPWS COMPUTER , PULSATING SOUND GONE CLEARED. PARTS USED: 1853965,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1853965 SN OFF 9003