As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM INOPERATIVE RTFL. SATCOM INOPERATIVE & POSSIBLY INTERMITTENT AT BEST, THE BITE ON CDU SHOWS ALL OK. THE HIGH POWER AMPLIFIER WAS PREVIOUSLY REPLACED, RT HF IS DEFERRED. AHM SHOWS MX MESSAGE 23204 POSSIBLE SDU FAIL. REPLACED SDU & OPERATION CHECKED SATISFACTORY IAW AMM 23-25-00. SOFTWARE, CONFIG & TESTED ALL GOOD.