What was found
SFO - SMOKE REPORTED IN COCKPIT DURING CRUISE. CREW DECLARED EMERGENCY AIRCRAFT RETURNED TO STATION. MAINTENANCE FOUND AUXILIARY HEAT BACKLIGHTING INOPERATIVE AT FIRST OFFICERS SKIRT PANEL. DEFERRED BACKLIGHTING PER MEL 33-1. AIRCRAFT RETURNED TO SERVICE. MAINTENANCE SUBSEQUENTLY CLEARED DEFERRAL BY RELAMPING AUXILIARY HEAT BACKLIGHTING. OPERATIONAL CHECK SATISFACTORY. (M)