As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CENTER VHF RADIO WILL NOT GO TO DATA MODE. RIGHT VHF WORKS OK IN DATA. T-S REF FIM 23-27 TASK 80 6, REPLACED LEFT AMIS CPM-COMM MODULE M001 (M31101) & GROUND TEST LEFT AMIS, OP TESTED, LEFT DCMF -MODEM RESET PASSED. AND NO MORE MESSAGES.