As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT NUMBER 2155, FO OVERHEAD MAP LIGHT NOT ILLUMINATED WHEN RHEOSTAT TURNED UP. SMOKE POURED OUT OF THE PLASTIC NEAR THE LIGHT. DEACTIVATED FO'S MAP LIGHT BY PULLING CIRCUIT BREAKER AND COLLARED. REMOVED AND REPLACED FIRST OFFICERS OVERHEAD MAP LIGHT REHOSTAT. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.