What was found
JFK/SFO - FLT 23 - ATB DUE AT 13,500 FEET. FELT VIBRATION IN AIRCRAFT. INITIALLY, ALL PARAMETERS NORMAL. A FEW SECONDS LATER, CAPTAIN CALLED, LOSING NR 1 ENGINE, NR 1 EGT STARTED CLIMBING AND VIBRATION INCREASED. NR 1 ENGINE WAS SHUT DOWN IAW ENGINE FIRE, SEVERE DAMAGE OR SEPARATION CHECK LIST. APPROXIMATELY 30 SECONDS LATER, NR 1 FIRE HANDLE ILLUMINATED WITH THE NR 1 B-LOOP CLIMBING TO TOP OF SCALE. NR 1 LEFT FIRE BOTTLE WAS DISCHARGED AND IN-FLIGHT INDICATIONS WERE THAT FIRE WAS EXTINGUISHED. FOUND NR 3 BEARING COMPT BREATHER TUBE FITTING BURNED THROUGH CAUSING OIL FIRE. REMOVED AND REPLACED NR 1 ENGINE. INITIAL CAUSE TO BE DETERMINED UPON REMOVED ENGINE TEAR DOWN REPORT. (X)