As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ADJUSTING FIRST OFFICER'S OVERHEAD MAP LIGHT, SPARKING AND SMOKE CAME FROM BEHIND IT. MAP AND BRIEFCASE CIRCUIT BREAKER TRIPPED. FOUND WIRE L453A24 BEHIND THE FIRST OFFICER'S MAP LIGHT CHAFED THROUGH AND SHORTING TO GROUND. REPLACED A FIVE INCH SECTION OF WIRE L453A24 FROM TERMINAL END BACK IAW DC-9 AMM 20-50-01-2.