MLG DIVERTED TO LAND DUE TO CABIN FIRE.

Narrative

COMING UP OVER BUF; ENRTE TO ROC; THE FIRST FLT ATTENDANT CAME INTO THE COCKPIT AND RPTED SMOKE IN THE CABIN. I ASKED THE FIRST FLT ATTENDANT IF HE HAD SEEN ANY OPEN FLAME; AND HE REPLIED THAT HE HAD. WE IMMEDIATELY TURNED OFF THE GALLEY PWR AND THE GASPER FAN. BUF WAS THE NEAREST ARPT; SO WE BEGAN OUR DIVERSION INTO THERE. BY THAT TIME THE FIRST FLT ATTENDANT RPTED BACK AND TOLD US THAT HE THOUGHT THE FIRE WAS OUT AND THAT HE HAD SHOT SOME HALON INTO THE AREA. AS A PRECAUTION WE MADE ARRANGEMENTS FOR CFR TO MEET US ON THE RWY. WE CALLED THE FIRST FLT ATTENDANT PRIOR TO LNDG TO UPDATE US ON THE CONDITION OF THE FIRE AND TO MAKE SURE THAT A EVAC WOULD NOT BE NECESSARY. HE CONFIRMED THAT WITH US. OUR LNDG WAS UNEVENTFULLY. AFTER LNDG THE CFR UNITS APCHED THE AIRPLANE. WE COMMUNICATED WITH THEM; THROUGH ATC; ABOUT THE CONDITION OF OUR AIRPLANE. THEY SAW NO SMOKE; AND WE HAD NO SMOKE IN THE CABIN SO WE TAXIED TO THE GATE. UPON ARR AT THE GATE WE DID A TOTAL SHUTDOWN OF THE AIRPLANE. CFR PERSONNEL IMMEDIATELY BOARDED THE AIRPLANE TO CONFIRM THE FIRE WAS OUT. UPON INSPECTION OF THE AREA IT WAS DETERMINED TO BE A LIGHTING BALLAST HAD MELTED AND STARTED A SMALL FIRE. THE ASSOCIATE CIRCUIT BREAKER WAS FOUND TO BE POPPED. TOTAL TIME FROM BEGINNING OF INCIDENT TO BLOCK IN AT GATE WAS 8-10 MIN.