What was found
FLT 6372 - IAD-AIB - DURING CRUISE, MADE AN SCHEDULED FLIGHT WITH ONE DISCREPANCY WHICH WAS THE SMELL OF SMOKE AND THE OVERHEAD PANEL LIGHTS WENT OUT. MAINTENANCE INSPECTED AND FOUND COCKPIT CONVERTER SOURCE OF PROBLEM. MAINTENANCE OPENED DMI 18309 , MEL 33-1 ON CONVERTER. MAINTENANCE CLOSED DMI 18309 BY REMOVING AND REPLACING DIMMER SWITCH, OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (M)