What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY DECLARED & ACFT RETURNED TO PHL DUE THE FLT CREW REPORTING ON TAKEOFF ENG 2 HAD A VERY SLOW SPOOL UP MORE SO THAN NORMAL & ON TAKEOFF AT 500 FT HAD ENG 2 FIRE ECAM. FLT CREW RAN ECAM & WHEN THRUST LEVER BROUGHT TO IDLE ECAM WENT AWAY WITH NO INDICATION OF FIRE ON OVRHD PANEL. FLT CREW ELECTED TO KEEP ENG RUNNING SINCE ENG WAS RUNNING NORMALLY & EVERYTHING RAN NORMAL THE REST OF THE WAY INTO PHL. ACFT LANDED SAFELY AT PHL WHERE EMERGENCY VEHICLES MET US ON THE RUNWAY & SHOWED NO ADNORMAL TEMPS FROM ENG & ACFT TAXIED TO THE MAINT HANGER UNDER OWN POWER - MAINT FOUND UPPER HIGH PRESSURE DUCT DISCONNECTED & DAMAGED ON ENG 2. MAINT REPLACED UPPER HIGH PRESSURE DUCT IAW AMM 36-11-49 & ACCOMPLISHED A SATISFACTORY OPS CHK WITH NO FAUTS NOTED.