As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/O HDG BUG + FD LATERAL GUIDANCE MISSING IN ALL MODES. GROUNDED - YES. PERFORMED DFC BITE. BITE TEST GOOD. FAULT HISTORY SHOWED CHANNEL B, FCC B SUSPECTED ON TOGA. PERFORMED FLIGHT DIRECTOR ADDITIONAL TEST. NO FAULTS. PERFORMED FCC B LRU TEST ON CHANNEL B. NO FAULTS. CHECKED DISCRETE INPUTS TO BOTH FCC FROM BOTH TOGA SWITCHES. BOTH INPUTS SHOWED GROUND WHEN TOGA PRESSED. REF B737-800 FIM 2211 TASK 801. ALL TESTS PASSED.