What was found
ON CLIMBOUT FROM BDL PASSING THROUGH FL6000 HEARD AND FELT A LOUD EXPLOSION FROM AREA OF THE FORWARD CARGO NR 2 ENG. DIVERTED TO JFK, THE STALL NOISE WAS AUDIBLE FROM COCKPIT BUT ENGINE INST WERE NORMAL ON BOTH ENGINES. FOUND 5 FAN BLADES CURLED AT TIP. BLENDED ALL BLADES AS REQUIRED, PER AMM 72-00. ALL BLADES ARE WITHIN CONTINUE IN SVC LIMITS EXCEPT FOR 2. THE 2 BLADES ARE WITHIN THE 5 CYC LIMITS. PERFORMED BORESCOPE PER AMM 72-00. CLOSED COWLS. PERFORMED T/O PWR R/U. NO VIBS FELT. ALL OPS.