As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C ON A/P B LOST FLT PLAN AND LNAV ALONG WITH A/P D/RST AND P/RST FLASHING CAUTION LIGHTS. TRANSFERRED TO A A/P AND ENGAGED LNAV. OPERATED NORMALLY ON A SIDE. ALL MESSAGES CLEARED BY THEMSELVES. REENGAGED B SIDE AND OPERATED NORMALLY. GROUNDED - YES. PERFORMED DFCS BITE REF B737-9 AMM 22-11-00. NO FAULTS FOUND AND AUTOPILOT TESTS PASSED..