B737 HAS ENG FAILURE SHORTLY AFTER TKOF AND RETURNS.

Narrative

WE STARTED OUT WITH A FUEL LEAK ON THE #2 ENG. MAINT CAME OUT AND WE RAN THE ENG AT IDLE PWR. THE MECH SIGNED OFF THE LOGBOOK AND WE DEICED THE ACFT; THEN PUSHED 13 MINS LATE. EARLY IN THE TKOF AFTER THRUST WAS SET (MAX PWR DUE TO DEICING) WE SAW A BLEED TRIP LIGHT. I ELECTED TO CONTINUE BECAUSE THRUST WAS SET AND THERE WAS NO OTHER INDICATION OF PROBS. AT ABOUT 2000-3000 FT; WE HEARD A SERIES OF POPS/BANGS FROM THE L SIDE OF THE ACFT. ENG INDICATIONS WERE ERRATIC SO I RETARDED THE #1 THRUST LEVER UNTIL IT APPEARED TO STABILIZE. THE FLT ATTENDANT RANG THE COCKPIT AND WE DID NOT ANSWER IMMEDIATELY BECAUSE WE WERE A LITTLE BUSY RIGHT THEN. WHEN WE ANSWERED THE FLT ATTENDANT CALL; SHE TOLD US THE L ENG WAS ON FIRE. WE CHKED THE FIRE WARNING SYS AND IT TESTED GOOD. I DECIDED TO SHUT DOWN THE ENG AND BLOW THE FIRE BOTTLE BASED ON THE RPTED FIRE. WE PROCEEDED TO INTXN FOR ONE TURN IN HOLDING TO RUN CHKLISTS; CHK PERFORMANCE AND TALK TO DISPATCH. PERFORMANCE WAS GOOD FOR A FLAPS 15 DEG LNDG AT ZZZ (117000 LBS) SO WE DECIDED TO RETURN RATHER THAN GO TO A LONGER AT ZZZ2. WE TOLD THE FLT ATTENDANTS TO SECURE THE CABIN FOR A NORMAL LNDG; THEN MADE A PA TO INFORM THE CUSTOMERS. WE DID AN UNEVENTFUL FLAPS 15 DEG LNDG THAT WAS; I MIGHT ADD; QUITE IMPRESSIVE.