As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MASTER CAUTION AND MASTER CAUTION ANNUNCIATOR LIGHTS ON BOTH SIDES DOES NOT WORK WHEN TEST PUSHED OR ANY PROBLEM ASSOCIATED WITH THOSE LIGHTS.CORRECTIVE ACTION HAS BEEN PERFORMED FIM 31-52 TASK 801. REPAIRED ELECTRICAL WIRE IAW SWPM 20-10-13 AND WDM 31-52-11, TEST OK.