As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STALL WARNING OPERATIONAL CHECK, FAILS STEP B.(17). WITH R AIR DATA AOA SENSOR C-B (11F31) PULLED AND F/O'S ALT INST SELECTED, 'WARN ELEX' MESSAGE STAYS ON EICAS & R STALL WARNING WILL NOT TEST. REPLACED STALL WARNING MODULE M938 AND CHECKED OKAY.