As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEADING SELECT KNOB WILL NOT CHANGE HEADING. REPLACED DFCS MODE CONTROL PANEL AND TESTS NORMAL IAW MM 22-11-34. BITE TEST GROUP NR 32 PASS. DFCS LRU INTERFACE TEST PASS IAW MM 22-11-34. DFCS LAND VERIFIY TESTS NORMAL IAW MM 22-00-00. HGS SENSOR TEST FOR FCC/AT NORMAL IAW MMS 34-36-00. ETOPS GROUND VERIFICATION SUCCESSFUL.