As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO PILOT B DISCONNECTS AFTER 4-5 SECONDS. GROUNDED - YES. ACCOMPLISHED FLIGHT FAULT REVIEW. FOUND FAULT IN HISTORY 22-11132, 22-11149. PERFORMED DFCS BITE TEST REF B737-800 FIM 22-11 TASK 801. NO FAULTS FOUND. PERFORMED AUTO PILOT A&B CURRENT STATUS. ALL TESTS PASSED. REF FIM 22-11 TASK 801. IN ADDITION PERFORMED LAND VERIFY. ALL TESTS PASSED REF B737-800 AMM TASK 22-11-00-700-801.