As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 4115 - FIRST OFFICER'S MAP LIGHT SOCKET SHORTED OUT AND CAUSED SMOKE IN THE COCKPIT. MEL'D COCKPIT LIGHTING. REMOVED AND REPLACED MAP LIGHT ASSEMBLY AND RHEOSTAT. OPERATIONAL CHECK GOOD. CLEARED MEL. REF: OPER CONTROL NR 98ZZZX4101. (X)