As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO PILOT "A" DISCONNECTED IN CRUISE FLT, RE-ENGAGED, AFTER 5 MINUTES AUTOPILOT DISCONNECTED, SWITCHED TO AUTO "B" WORKS FINE. GROUNDED - YES. REF B737-900 FIM 22-11 TASK 854 PERFORMED LLM AUTOLAND TEST, ALL TEST PASSED NO FAULTS DETECTED AT THIS TIME. CAT III AUTOLAND AUTHORIZED.