As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MASTER CAUTION OVERHEAD ILLUMINATED WITH AMBER MAINT LIGHT AFTER LANDING, RAN QRH, LIGHT STILL ILLUMINATED. GROUNDED - YES. PERFORMED ENGINE #1 INTERROGATION MSG 77-43022 ACTIVE. PERFORMED B737-9 IFIM TASK G77-12-00-810-806 . CLEARED STATUS MSG AND PERFORMED ENG #1 IDLE RUN. AFTER GROUND TEST DISPLAY FAULT NON EXISTANT, THEN IT IS AN INTERMITTENT FAULT. A/C OK FOR SERVICE.