As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT B FAILED ENROUTE. AUTOPILOT A WORKS NORMAL. GROUNDED - YES. REMOVED & REPLACED FCC-B REF B737-9 AMM 22-11-33-400-801. ACCOMPLISHED DFCS LRU REPLACEMENT TEST FOR DFCS/ AT REF AMM 22-11-33/401. ALL TESTS PASSED. ACCOMPLISHED LAND VERIFY TEST REF AMM 22-11-00/201. ALL TESTS PASSED. GROUND VERIFICATION SUCCESSFUL.