As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN THE TEST MODE OF THE CAUTION PANEL, NONE OF THE CAUTION LIGHTS ILLUMINATE EXCEPT FOR THE CAUTION PANEL LIGHT. WHEN AN ACTUAL MALFUNCTION EXISTS, GET LIGHT AND A MASTER CAUTION LIGHT. EVERYTHING WORKS NORMALLY EXCEPT FOR THE PRESS-TO-TEST MODE. SUSPECT CAUSE: INTERNAL FAILURE OF PRESS-TO-TEST CIRCUITRY.